Любой код CSS состоит из трёх частей: селектор, параметр и аргумент.

#селектор {параметр: аргумент}

#селектор - это название элемента, который мы меняем в дизайне. Например: когда на форум в поле "Объявление" в администрировании мы что-то ставим и нажимаем "Показать объявление", на главной странице под юзер-ссылками появляется наш контент, а над ним слово "Объявление". Селектор этого самого слова выглядит так: #pun-announcement h2. Селектор всего блока объявления выглядит так: #pun-announcement .container и так далее...
параметр: - это то, что мы собираемся менять в нашем элементе. Это может быть цвет, шрифт, фон, выравнивание, границы и так далее.
аргумент - это значение параметра. Ты знаешь, как я хреново объясняю, поэтому сразу пример: у параметра шрифта аргумент будет заключаться в названии шрифта.
Конкретный пример:

#pun-announcement h2 {text-align: center;
text-transform: uppercase;
font-family: Arial;
font-size: 0.9em}

После каждого значения, кроме последнего, должна стоять точка с запятой, иначе код не будет работать.
text-align: center; - выравнивает заголовок "Объявление" по центру.
text-transform: uppercase; - делает все буквы заглавными.
font-family: Arial; - делает текст шрифтом Arial.
font-size: 0.9em; - делает текст уменьшенным, как 8px в форме ответа.
Можно придавать одни и те же параметры для нескольких элементов. Для этого достаточно записать селекторы через запятую.

Код:

/****************************
A - SETUP
*************************************************/

/* A1 Import the colour scheme
-------------------------------------------------------------*/

/* A1.1 */
  @import url(style_cs.css);

/* A2 Deal with browser defaults and wonkiness
-------------------------------------------------------------*/

/* A2.1 */
html, body {margin: 0; padding: 0}

/* A2.2 */
.punbb * {
  margin: 0
  }

/* A2.3 */
.punbb ul, .punbb dl, .punbb li, .punbb dd, .punbb dt {
  padding: 0;
  list-style: none;
  }

/* A2.4 */
.punbb img {
  border:none
  }

/* A2.5 */
.punbb .main table {
  table-layout: fixed;
  width: 100%;
  }

/* A2.6 */
.checkfield input[type="checkbox"], .radiofield input[type="radio"] {margin: 0 0.3em;}

/* A2.7 */
p[class="checkfield"] *,
div[class="checkfield"] *,
fieldset[class="radiofield"] * {
  height: 1.8em;
  vertical-align: middle
  }



 /* A3 Text setup
-------------------------------------------------------------*/

/* A3.1 */
body {
  font-size: 100.01%;
  }

/* A3.2 */
.punbb {
  font: normal 68.75% verdana, arial, helvetica, sans-serif;
  }

/* 3.3 */
.punbb textarea, .punbb input, .punbb select, .punbb optgroup {
  font: 1em verdana, arial, helvetica, sans-serif
  }

/* A3.4 */
.punbb h1, .punbb h2, .punbb h3, .punbb h4, .punbb table, .punbb th {
  font-size: 1em;
  font-weight: normal;
  }

/* A3.5 */
.punbb h1 span, .punbb h2 span, .punbb legend span {
  background: tranparent!important; 
  font-size: 1.1em;
  }

/* A3.6 */
.punbb pre {
  font: 1.1em/140% monaco, "bitstream vera sans mono", "courier new", courier, monospace
  }

/* A3.7 */
.punbb address, .punbb em {
  font-style: normal
  }

/* A3.8 */
.punbb .post-content em {
  font-style: italic
  }

/* A3.9 */
.punbb .post-content em.bbuline {
  font-style: normal;
  text-decoration: underline;
  }

/* A3.10 */
.punbb a {
  text-decoration: underline
  }

/* A3.11 */
.punbb optgroup {
  font-weight: bold;
  }


/* A4 Float clearing and hidden items
-------------------------------------------------------------*/

/* A4.1 */
#pun:after,
.punbb .container:after,
.punbb .post-links ul:after,
.punbb .main div.inline:after,
.punbb .post-box:after,
.punbb .linksb:after {
  clear: both;
  content: ".";
  display: block;
  height: 0;
  visibility: hidden;
  overflow:hidden;
  line-height: 0.0;
  font-size: 0;
  }

/* A4.2 */
.acchide,
#pun-index #pun-main h1,
#pun-navlinks h2,
#pun-pagelinks h2,
#pun-status h2,
#pun-ulinks h2,
.punbb .forum h2,
.punbb .multipage .topic h2,
.punbb dl.post-sig dt span,
.punbb p.crumbs strong,
.punbb .divider hr,
.punbb .required label em,
.punbb .formsubmit label,
.punbb .submitfield label,
.punbb .modmenu label,
#pun-userlist .main h2 {
  font-size: 0;
  height: 0;
  width: 0;
  line-height: 0.0;
  position:absolute;
  left: -9999px;
  overflow: hidden
  }


/* A5 Basic page layout and borders
-------------------------------------------------------------*/

/* A5.1 */
#pun {
  margin: auto;
  width : 840px;
  position: relative;
  padding-bottom: 100px;
  }

/* A5.2 */
.punbb {
  float: left;
  width: 100%;
  height: auto;
  }

/* A5.3 */
#pun-redirect, #pun-maint {
  margin: 0px 25% 0 15%;
    width: 666px;
    height: 414px;
    font-size: 0!important;
    content: none!important;
    float: none;
    background: transparent url(http://s1.uploads.ru/i/h/N/Z/hNZAn.jpg) no-repeat;
    }    

#pun-redirect .main-title {display: none;}

/* A5.4 */
.punbb .section, .punbb .main {
  margin-bottom: 1em;
  }

/* A5.5 */
.punbb .category, .punbb .post {
  margin-top: 0.4em;
  }

/* A5.6 */
.punbb #pun-category1, .punbb .toppost, .punbb .topicpost {
  margin-top: 0;
  }

/* 5.7 */
#pun-post .topic {
  margin-top: 1em;
  }

/* A5.8 */
.punbb .section, .punbb .forum, .punbb .formal, .punbb .modmenu, .punbb .info,
.punbb .category, .punbb .post {
  border-style: none none solid none;
  border-width: 0px 0px 2px 0px
  }

/* A5.9 */
.punbb .container {
  border-style: solid;
  border-width: 1px;
  }


/* A5.10 */
.punbb .section h2, #pun-main h1, #pun-debug h2 {
color: #888;
text-decoration: none;
font-weight: none;
text-transform: uppercase!important;
letter-spacing: -1px;
font-family: arial;
font-size: 2em;
text-align: center;
padding: 0px;
text-shadow: none;
  }


/*****************************
B - MAIN CONTENT - GENERAL
************************************************/

/* B1 Parsed Content, Signatures and Scroll Boxes
-------------------------------------------------------------*/

/* B1.1 */
.punbb .post-content {
  padding: 0;
  margin: 0;
  width: 100%;
  overflow: hidden;
  }

/* B1.2 */
.punbb .post-sig dt {
  display: block;
  border-top: 1px solid #888;
  width: 250px;
  margin: 5px 0;
  }

/* B1.3 */
.punbb .post-content p {
  margin: 0;
  padding: 0 0 1em 0;
  line-height: 150%;
  }

/* B1.4 */
.punbb .post-content img {
  vertical-align: text-bottom
  }

/* B1.5 */
.punbb .post-content img.postimg {
  vertical-align: middle;
  }

/* B1.6 */
.punbb .post-content .blockcode, .punbb .post-content blockquote {
  width: 100%;
  overflow: hidden;
  }

/* B1.7 */
.punbb .post-content .scrollbox {
  width: 100%;
  overflow: auto;
  }

/* B1.8 */
.punbb .post-content .quote-box, .punbb .post-content .code-box {
  margin: 0.4em 1.8em 1.4em 1.8em;
  padding: 1em;
  border-width: 1px;
  border-style: solid;
  border-color: #888;
  }

/* B1.9 */
.punbb .quote-box cite, .punbb .code-box strong.legend {
  display: block;
  padding-bottom: 0.7em;
  font-size: 1.1em;
  font-weight: bold;
  font-style: normal;
  margin: 0; 
  }

/* B2 Information boxes
-------------------------------------------------------------*/

/* B2.1 */
.punbb .info-box {
  padding: 1.1em 1.7em 1em 1.7em;
  border-style: solid;
  border-width: 1px;
  margin: 0 0 1.1em 0;
  }

/* B2.2 */
.punbb .info-box * {
  padding: 0 0 0.7em 0;
  }

/* B2.3 */
.punbb #pun-main .info-box .legend {
  font-size: 1.1em;
  font-weight: bold;
  }


/* B3 Pagination and posting links
-------------------------------------------------------------*/

/* B3.1 */
.punbb .linkst {
  float: left;
  position: relative;
  width: 100%;
  font-size: 1.1em;
  height: 0;
  }

/* B3.2 */
.multipage {
  margin-top: 3em;
  }

/* B3.3 */
.linkst .pagelink {
  position: absolute;
  top: -4em;
  left: 1em;
  width: 24em;
  }

/* B3.4 */
.linkst .postlink {
  position: absolute;
  top: -4em;
  right: 1em;
  width: 16em;
  text-align: right;
  font-weight: bold;
  }

/* B3.5 */
.punbb .linksb {
  text-align: right;
  padding: 0.4em 1em 0.5em 1em;
  font-size: 1.1em;
  }

/* B3.6 */
.linksb .pagelink {
  float: left;
  width: 24em;
  text-align: left;
  }

/* B3.7 */
.linksb .postlink {
  float: right;
  width: 16em;
  font-weight: bold
  }

/* B3.8 */
.subscribelink {
  clear:both;
  padding-top: 0.3em;
  padding-bottom: 0.5em;
  }


/**************************************
C - MAIN CONTENT - SPECIFIC
***************************************************

/* C1 Form layout
-------------------------------------------------------------*/

/* C1.1 */
.punbb .formal .container {
  padding: 1.7em 2.3em 1.1em 2.3em;
  }

/* C1.2 */
.punbb .formsubmit {
  padding: 0 0 0 1.7em;
  margin: 1em 0 0 0;
  }

/* C1.3 */
.punbb .formsubmit input, .punbb .formsubmit a, .punbb .formsubmit span {
  margin: 0 0.6em 0 0
  }

/* C1.4 */
.punbb fieldset {
  border-style: solid;
  border-width: 1px;
  padding: 0 18px 0 18px;
  margin: 0 0 1em 0
  }

/* C1.5 */
.punbb fieldset legend {
  padding: 0;
  margin: 0 0 0 11px;
  font-size: 1.1em
  }

/* C1.6 */
.punbb fieldset legend span {
  padding: 0 5px;
  margin: 0 0 0 -15px;
  }

/* C1.7 */
.punbb fieldset fieldset {
  border-style: none;
  margin: 0;
  padding: 0 0 8px 0
  }

/* C1.8 */
.punbb .fs-box {
  padding: 1em 0 0.8em 0;
  }

/* C1.9 */
.punbb .fs-box p, .punbb .fs-box fieldset {
  padding: 0 0 0.8em 0
  }

/* C1.10 */
.punbb .inline .inputfield, .punbb .inline .selectfield, .punbb .inline .passfield {
  float: left;
  margin-right: 1em;
  }

/* C1.11 */
.punbb .inline .infofield {
  clear:both
  }

/* C1.12 */
.punbb .datafield br {
  display: none
  }

/* C1.13 */
.punbb .required label, .punbb .datafield span.input {
  font-weight: bold
  }

/* C1.14 */
.punbb .datafield span.input a {
  font-weight: normal;
  }

/* C1.15 */
.punbb .areafield span.input, .punbb p.longinput span.input {
  display: block;
  padding: 0 12em 0 0;
  height: 100%; /* For IE */
  }

/* C1.16 */
.punbb textarea, .punbb .longinput input {
  width: 64%;
  margin: 0;
  }

/* C1.17 */
.punbb .hashelp {
  position: relative;
  }

/* C1.18 */
.punbb .helplinks {
  display: block;
  position: absolute;
  top: 1em;
  right: 0;
  font-weight: normal;
  width: 36%;
  }

/* C1.19 */
.punbb #profile .helplinks {
  top: 1.5em;
  }

/* C1.20 */
.punbb .helplinks span {
  display: block;
  padding-bottom: 0.2em;
  }

/* C1.21 */
#pun-post .formal .info-box li {
  padding-left: 4px;
  list-style-type: square;
  list-style-position: inside;
  line-height: 1.5;
  margin: 0;
  }


/* C2 Table layout
-------------------------------------------------------------*/

/* C2.1 */
.punbb .main .tcl {
  overflow: hidden;
  text-align: left;
  width: 60%;
  }

/* C2.2 */
.punbb .main .tc2, .punbb .main .tc3, .punbb .main .tcmod {
  text-align: center;
  width: 8%;
  }

/* C2.3 */
.punbb .main .tcr {
  overflow: hidden;
  text-align: left;
  width: 30%;
  }

/* C2.4 */
#pun-userlist .main .tcl,
#pun-searchtopics .main .tcl,
#pun-modviewforum .main .tcl {
  width: 40%
  }

/* C2.5 */
#pun-userlist .main .tc2,
#pun-searchtopics .main .tc2 {
  text-align: left;
  width: 20%;
  }

/* C2.6 */
#pun-debug table .tcl {
  width: 15%;
  white-space:normal;
  }

/* C2.7 */
#pun-debug .tcr {
  width: 90%;
  white-space: normal;
  }

/* C2.8 */
#pun-index .tcl h3 {
  font-size: 1.2em;
  font-weight: bold;
  }

/* C2.9 */
.punbb td span.youposted {
  font-weight: bold;
  margin-left: -1em;
  position: absolute;
  }

/* C2.10 */
.punbb td .modlist {
  display: block;
  padding-top: 0.3em
  }

/* C2.11 */
.punbb .main td {
  border-style: solid none none solid;
  border-width: 1px 0 0 1px;
  padding: 0.8em 1em;
  }

/* C2.12 */
.punbb .main th {
  border-style: none none none solid;
  border-width: 0 0 0 1px;
  padding: 0.4em 1em 0.4em 1em;
  font-size: 0.9em;
  text-align: center!important;
  }

/* C2.13 */
.punbb .main .tcl {
  border-left-style: none;
  border-left-width: 0;
  }

/* C2.14 */
.punbb td div.tclcon {
  margin-left: 0px;
}

/* C2.15 */
.punbb div.icon {
  float: left;
  display: block;
  width: 62px;
  height: 48px;
}

 /* C3 Topics
-------------------------------------------------------------*/

/* C3.1 */
.punbb .post .container {
  border-style: none solid solid solid;
  border-width: 1px;
  margin-top: -1px;
  padding-bottom: 1px;
  }

/* C3.2 */
.punbb .post h3 {
  border-style: solid solid none solid;
  border-width: 1px;
  }

/* C3.3 */
.punbb .post h3 span {
  padding: 0.5em 1em;
  display: block;
  margin-left: 19em;
  border-left-style: solid;
  border-left-width: 1px
  }

/* C3.4 */
.punbb .post h3 strong {
  float: right;
  width: 5em;
  text-align: right;
  font-weight: normal;
  }

/* C3.5 */
.punbb .post .post-author {
  float: left;
  width: 19em;
  margin-top: -1.5em;
  overflow: hidden;
  }

/* C3.6 */
.punbb .post .post-author ul, .punbb .post .post-author p {
  padding: 0 1em 1em 1em;
  line-height: 140%;
  text-align: left;
  }

/* C3.7 */
.pa-author {
  font-size: 1.3em;
  text-align: center;
  border-bottom: 1px solid #ccc;
  line-height: 1.5em;
  font-weight: bold;
  }

.pa-title, .pa-avatar {text-align: center;}

/* C3.8 */
.pa-author a {
  text-decoration: none
  }

/* C3.9 */
li.pa-title {
  font-size: 0.9em;
  padding: 1px;
  margin-bottom: 2px;
  font-weight: bold;
  }

li.pa-online {
  line-height: 0.8em;
  border-width: 0 0 0 3px;
  border-style: solid;
  border-color: #939eb4;
  padding-left: 0.4em;
  margin-top: 0.7em;
  }

/* C3.11 */
.punbb .post-body {
  margin-left: 19em;
  border-left-style: solid;
  border-left-width: 1px;
  padding: 0 0 1px 0;
  }

/* C3.12 */
.punbb .post-box {
  padding: 1em;
  }

/*C3.13 */
.punbb fieldset .post-box {
  margin-bottom: 0.8em
  }

/* C3.14 */
.punbb .post-links {
  margin-left: 19em;
  border-left-style: solid;
  border-left-width: 1px;
  }

/* C3.15 */
.punbb .post-links ul {
  padding: 0 1em 0 0;
  height: 2em;
  line-height: 2em;
  margin-left: -19em;
  border-top-style: dashed;
  border-top-width: 1px;
  background: transparent;
  text-align: right;
  }

/* C3.16 */
.punbb .post-links li {
  display: inline;
  padding-left: 1em;
  }

/* C3.17 */
.pl-email, .pl-website {
  float: left;
  }

/* C3.18 */
.punbb .clearer {
  clear: both;
  height: 0;
  font-size: 0;
  }


/* C4 Moderator menu
-------------------------------------------------------------*/

/* C4.1 */
.punbb .modmenu .container {
  padding: 0.5em 1em;
  text-align: right;
  }

/* C4.2 */
.punbb .modmenu strong, .punbb .modmenu a {
  height: 1.8em;
  line-height: 1.8em;
  }

/* C4.3 */
.punbb .modmenu .container strong {
  float: left;
  }

/* C4.4 */
.punbb .modmenu input {
  margin-left: 1em;
  }


/* C5 Message boxes
-------------------------------------------------------------*/

/* C5.1 */
.punbb .info .container {
  padding: 0.8em 1em
  }

/* C5.2 */
.punbb .info .container .backlink {
  padding-top: 0.8em;
  }


/* C6 Profile
-------------------------------------------------------------*/

/* C6.1 */
#profile .container {
  padding-left: 18.6em;
  }

/* C6.2 */
#profilenav {
  float: left;
  width: 14em;
  margin-left: -16.3em;
  display: inline;
  }

/* C6.3 */
#profilenav li {
  padding-bottom: 0.8em;
  font-weight: bold;
  }

/* C6.4 */
#viewprofile ul, #profilenav ul {
  border-style: solid;
  border-width: 1px;
  padding: 1.5em 18px 0.8em 18px;
  margin: 0 0 1em 0;
  }

/* C6.5 */
#viewprofile h2, #profilenav h2 {
  background: transparent;
  border: none;
  padding: 0 0 0 0;
  margin: 0 14px -0.6em 14px;
  }

/* C6.6 */
#viewprofile h2 span, #profilenav h2 span {
  padding: 0 5px;
  position: relative;
  }

/* C6.7 */
#viewprofile li, #setmods dl {
  padding: 0 0 0 16em;
  margin-bottom: 0.2em;
  }

/* C6.8 */
#viewprofile li span {
  float: left;
  width: 14em;
  margin-left: -16em;
  padding: 0.5em 1em;
  font-weight: bold;
  }

/*C6.9 */
#setmods dt {
  float: left;
  width: 14em;
  margin-left: -16em;
  padding: 0.8em 1em;
  font-weight: bold;
  display: inline;
  }

/* C6.10 */
#viewprofile li strong, #viewprofile li div, #setmods dd {
  display: block;
  padding: 0.5em 1em;
  font-weight: normal;
  }

/* C6.11 */
.punbb img.avatardemo {
  float: right;
  margin: 0 0 0.8em 1.8em
  }


/* C7 User list
-------------------------------------------------------------*/

/* C7.1 */
#pun-userlist .formal, #pun-userlist .formal .container {
  border-bottom: none;
  margin-bottom: 0;
  }

/* C7.2 */
#pun-userlist .usertable .container {
  padding: 0 2.3em 2.3em 2.3em;
  border-top: none;
  }

/* C7.3 */
#pun-userlist .usertable table {
  border-style: solid;
  border-width: 1px;
  }


/***********************************************
D - PUNBB SECTIONS OTHER THAN MAIN CONTENT
******************************************************/

/* D1 Logo and description
-------------------------------------------------------------*/

/* D1.1 */
#pun-title {
  margin: 0;
  border-style: solid solid none solid;
  border-width: 1px 1px 0 1px;
  }

/* D1.2 */
#pun-title h1 {
  display : block;
  height : 0;
  padding: 2em 1em 0 1em;
  }

/* D1.3 */
#pun-title .container {
  border-style: none solid none solid;
  }

/* D1.4 */
#pun-title h1 span  {
  font-size: 1.5em;
  }

#pun-title table {background-image : url();
	border: none;
	height: 0;
	width: 100%;
}

#pun-title td.title-logo-tdl {
	border: none;
	width: 100%;
}

#pun-title td.title-logo-tdr {
border: none;
  vertical-align: top;
  margin-left: 24%;
  margin-top: 0px;}

#pun-title table tbody tr .title-logo-tdr {position: absolute; z-index: 1; left: 0px; top: 180px
    }

/* D2 Page navigation
-------------------------------------------------------------*/

/* D2.1 */
#pun-pagelinks {
  position: absolute;
  top: -150px;
  left: 0;
  margin: 0;
  border: none;
  padding: 0;
  width: 100%;
  }

/* D2.2 */
#pun-pagelinks .container {
  background: transparent;
  border: none;
  padding: 0}

/* D2.3 */
#pun-pagelinks .container li {
  display: inline
  }

/* D2.4 */
#pun-pagelinks li a, #pun-pagelinks a:link, #pun-pagelinks a:hover {
  height: 2em;
  line-height: 2em;
  padding: 0;
  font-size: 1.2em;
  margin-left: -9999px;
  display: block;
  float:left;
  width: 100%;
  }

/* D2.5 */
#pun-pagelinks a:active, #pun-pagelinks a:focus {
  position:relative;
  margin: 0;
  }

#pun-pagelinks li a span {
  display:block;
  margin: 0 1em
  }

/* D3 Forum navigation
-------------------------------------------------------------*/

/* D3.1 */
#pun-navlinks, #pun-navlinks .container {
  border-style: none;
  border-width: 0;
  text-align: center; 
  }

/* D3.2 */
#pun-navlinks .container {
  padding: 0.7em 1em;
  margin-top: 109px;
  text-align: center;
  }

/* D.3 */
#pun-navlinks li {
  display: inline;
  padding-right: 0.7em;
  }

/* D3.4 */
#pun-navlinks li a {
  font-size: 1.2em
  }

/* D4 User links
-------------------------------------------------------------*/

/* D4.1 */
#pun-ulinks  {
  margin-top: 0;
  }

/* D4.2 */
#pun-ulinks .container {
  text-align: center;
  margin-top: -23px;
  border-top: none;
  padding: 0.7em 1em;
  margin-bottom: 10px;
  }

/* D4.3 */
#pun-ulinks li, #pun-ulinks li a {
  display: inline;
  white-space: nowrap;
  }

/* D4.4 */
#pun-ulinks li a {
  padding: 0 0.3em 0 0.6em;
  font-size: 1em;
  }

/* D4.5 */
#pun-ulinks li.item1, #pun-ulinks li.item1 a {
  border-left-style: none;
  border-left-width: 0;
  padding-left: 0
  }

/* D5 Welcome box and Top Breadcrumbs
-------------------------------------------------------------*/

/* D5.1 */
#pun-status, #pun-status .container {
  border-bottom: none;
  margin-bottom: 0;
  }

/* D5.2 */
#pun-status .container {
  padding: 0.8em 1em 1em 1em;
  }

/* D5.3 */
#pun-status span {
  white-space: nowrap;
  margin-right: 0.5em;
  }

/* D5.4 */
#pun-crumbs1 {
  font-weight: bold;
  overflow: hidden;
  margin-top: 0;
  }

/* D5.5 */
#pun-crumbs1 p.container {
  border-top: none;
  padding: 1em 1em 0.8em 1em;
  font-size: 1.1em;
  }

/* D5.6 */
#pun-break1 {
  margin: 0 1em;
  border-style: solid none;
  border-width: 1px 0;
  height: 0;
  margin: -2px 1em;
  position: relative;
  z-index: 1;
  }

/* D6 Announcement
-------------------------------------------------------------*/

/* D6.1 */
#pun-announcement h2 {
  padding: 0;
  margin: 1px 1em 0em 1em;
  border-style: none none solid none;
  border-width: 0 0 1px 0;
  position: relative;
  font-weight: bold;
  }

/* D6.2 */
#pun-announcement h2 span {
  display: block;
  padding: 1em 0 0.8em 0;
  border-bottom-style: solid;
  border-bottom-width: 1px;
  }

/* D6.3 */
#pun-announcement .container {
  padding: 0.8em;
  margin-bottom: 15px;
  }

/* D7 Statistics
-------------------------------------------------------------*/

#pun-stats .container {
  padding: 0em 0em
  }

/* D7.2 */
#pun-stats li.item1, #pun-stats li.item2 {
  float: left;
  clear: both;
  line-height: 150%;
  }

/* D7.3 */
#pun-stats li.item3, #pun-stats li.item4 {
  text-align: right;
  line-height: 150%;
  }

/* D7.4 */
li#onlinelist {
  margin-top: 0.5em;
  border-top-style: solid;
  border-top-width: 1px;
  float: left;
  width: 100%;
  line-height: 130%;
  }

/* D7.5 */
li#onlinelist div {
  border-top-style: solid;
  border-top-width: 1px;
  padding: 0.5em 0 0 0;
  }

/* D8 Quick Jump - About - Bottom Breadcrumbs
-------------------------------------------------------------*/

/* D8.1 */
#pun-qjump {
  margin: 0;
  border: none;
  width: 50%;
  position: relative;
  float: left;
  }

/* D8.2 */
#pun-qjump .container {
  border: none;
  background: transparent;
  padding: 0.8em 1em;
  }

/* D8.3 */
#pun-about {
  margin-top: 5px;
  text-transform: uppercase;
  }

/* D8.4 */
#pun-about .container {
  border-top-style: none;
  text-align: center;
  font-size: 0.9em;
  line-height: 0%;
  padding-bottom: 90px;
  }

/* D8.5 */
#pun-about p span {
  display:block;
  padding-left: 0%;
  }

/* D8.6 */
#pun-crumbs2 {
  font-weight: bold;
  overflow: hidden;
  margin-bottom: 0;
  border-bottom: none;
  }

/* D8.7 */
#pun-crumbs2 .container {
  border-bottom: none;
  padding: 0.8em 1em;
  font-size: 1.1em;
  }

/* D8.8 */
#pun-break4 {
  margin: -2px 1em;
  border-style: solid none;
  border-width: 1px 0;
  position: relative;
  height: 0;
  z-index: 1;
  }

/* D8.9 */
div.punbb-admin #pun-about .container {
  border-top-style: solid;
  border-top-width: 1px;
  }


/* D9 Help file
-------------------------------------------------------------*/

/* D9.1 */
#pun-help .formal .info-box h3.legend {
  border-bottom-style: solid;
  border-bottom-width: 1px;
  padding-bottom: 0;
  margin-bottom: 0.8em;
  }

/* D9.2 */
#pun-help .formal .info-box h3.legend span {
  padding-bottom: 0.6em;
  display: block;
  border-bottom-style: solid;
  border-bottom-width: 1px;
  font-size: 1.1em;
  }

/* D9.3 */
#pun-help .formal p, #pun-help .formal dd {
  margin-bottom: 1em
  }

/* D9.4 */
#pun-help .formal ul, #pun-help .formal dl {
  padding: 0 0 0 1em
  }

/* D9.5 */
#pun-help .formal li {
  padding: 0;
  line-height: 130%
  }

/* D9.6 */
#pun-help .formal li * {
  vertical-align: text-top
  }

/* D9.7 */
#pun-help .formal dt span {
  font: 1.4em/120% monaco, "bitstream vera sans mono", "courier new", courier, monospace
  }

/* D9.8 */
#pun-help .formal .parsedmsg, #pun-help .formal .parsedmsg .incode {
  padding-bottom: 0;
  }

Код:

/* CS1 Background and text colours
-------------------------------------------------------------*/

#pun-title h1 span  {display: none}
HTML, BODY {
background-image: url("http://s1.uploads.ru/i/GciwC.jpg");
background-attachment: scroll;
background-repeat: no-repeat;
background-position: top center; 
}

HTML {background-image: url("http://s1.uploads.ru/i/iq0RA.jpg"); background-repeat: repeat-y; background-position: center top; 
background-color: #dddddd;
}

#pun_wrap {  background-image: url("http://s1.uploads.ru/i/UlMfT.jpg"); background-repeat: no-repeat; 
background-position: bottom center;
 }

/* CS1 Background and text colours
-------------------------------------------------------------*/

/* CS1.1 */
.punbb .section .container, .punbb .post-body, .punbb .post-links, .punbb td.tc2, .punbb td.tc3,
.punbb .formal fieldset .post-box, #viewprofile li strong, #viewprofile li div, #setmods dd,
.punbb .info-box, .punbb #pun-main .info-box .legend {
  background-color: transparent;
  color: #070f2b;
  }

/* CS1.2 */
.punbb .main .container, .punbb .post .container, .punbb .post h3, .punbb-admin #pun-admain .adcontainer {
  background-color: transparent;
  color: #070f2b;
  }

/* CS1.3 */
#pun-stats h2, .punbb .main h1, .punbb .main h2, #pun-debug h2, .punbb-admin #pun-admain h2, #pun-main h2 {
color: #888;
text-decoration: none;
font-weight: none;
text-transform: uppercase!important;
letter-spacing: -1px;
font-family: arial;
font-size: 2em;
text-align: center;
padding: 0px;
text-shadow: none;
background: none;
border: none;
}

  }

/* CS1.4 */
#pun-title, #pun-title .container {
  background-color: transparent;
  color: #000;}

/* CS1.5 */
#viewprofile h2 span, #profilenav h2 span {
background-color: transparent;
color: #888;
text-transform: uppercase!important;
letter-spacing: -1px;
font-family: arial;
text-shadow: none;
  }

/* CS1.6 */
.punbb .post h3 span, .punbb th, #viewprofile li, #setmods dl  {
  background-color: transparent;
  color: #000
  }

/* CS1.7 */
.punbb .quote-box, .punbb .code-box {
  background: #eee; 
  color: #000;}
  }

/* CS1.8 */
#pun-navlinks .container {
text-align: center;
  background-color: transparent;
  color: #000;
  }

.offline li.pa-online strong {
  font-weight: normal
  }

.punbb textarea, .punbb select, .punbb input {
background: #eee;
border: 1px solid #888;
padding: 2px 2px 2px 2px;
}

.punbb select, .punbb input {
background: #eee;}


/* CS2 Border colours
-------------------------------------------------------------*/

/* CS2.1 */
.punbb .container, .punbb .post-body, .post h3, #pun-title {
  border-color: transparent
  }

/* CS2.2 */
.punbb .section, .punbb .forum, .punbb .formal, .punbb .modmenu, .punbb .info,
.punbb .category, .punbb .post {
  border-color: transparent
  }

/* CS2.3 */
#pun-stats h2, .punbb .main h1, .punbb .main h2, #pun-debug h2, .punbb-admin #pun-admain h2 {
  background: none;
  }

/* CS2.4 */
.punbb td, .punbb fieldset, #viewprofile ul, #profilenav ul, .punbb .post .post-body,
.punbb .post h3 span, .post-links ul, .post-links, .usertable table {
  border-color: transparent;
  }

/* CS2.5 */
.punbb th {
  border-color: transparent
  }

/* CS2.6 */
.punbb .quote-box, .punbb .code-box {
  border-color: transparent;
  }

#pun-ulinks li, #pun-announcement h2 span, li#onlinelist, #pun-help .formal .info-box h3.legend span {
  border-color: transparent
  }

#pun-ulinks li a, #pun-announcement h2, li#onlinelist div, #pun-help .formal .info-box h3.legend {
  border-color: transparent
  }

.punbb .divider {
  border-color: transparent
  }

.punbb .formal fieldset .post-box, .punbb .info-box {
  border: 1px solid #222
  }

li.pa-online {
  border-left-color: #222;
  }

.punbb .post-sig dt {
  border-top-color: #070f2b !important;
  }


/* CS3 Links
-------------------------------------------------------------*/

/* CS3.1 */
.punbb a, .punbb a:link, .punbb a:visited, .punbb li.isactive a,
.punbb-admin #pun-admain a, .punbb-admin #pun-admain a:link, .punbb-admin #punbb-admain a:visited {
color: #333;
text-decoration: none;
font-weight: none

}

/* CS3.2 */
.punbb a:hover, .punbb a:focus, .punbb a:active, .punbb-admin #pun-admain .nodefault,
.punbb-admin #punbb-admain a:hover, .punbb-admin #punbb-admain a:focus, .punbb-admin #punbb-admain a:active {
color: #555;
border-bottom: none;
text-decoration: none;
font-weight: none;
background-color: none;

}



/* CS3.3 */
#pun-navlinks a {
color: #dedede;
text-decoration: none;
font-weight: none;
font-family: arial;
font-weight: none;
}

/* CS3.4 */
#pun-navlinks a:hover, #pun-navlinks a:focus, #pun-navlinks a:active {
color: white;
text-decoration: none;
}

#pun-navlinks  #navlogin a, #pun-navlinks  #navregister a{ 
position:relative; z-index:1200;
}

/* CS4 Post status icons
 -------------------------------------------------------------*/

       div.icon {border-color: transparent}
       tr.iredirect div.icon {border-color: transparent}
       div.inew {border-color: transparent}

       Div.icon {
              background-image : url(http://s1.uploads.ru/i/s0z7M.jpg);
              background-repeat: no-repeat;
              }
       TR.inew Div.icon {
              background-image : url(http://s1.uploads.ru/i/q4Tc1.jpg);
              background-repeat: no-repeat;
              }
       TR.isticky Div.icon {
              background-image : url(http://s1.uploads.ru/i/RQFt2.jpg);
              background-repeat: no-repeat;
              }
       TR.iclosed Div.icon {
              background-image : url(http://s1.uploads.ru/i/Ik29t.jpg);
              background-repeat: no-repeat;
              }


/* Скрытие или сдвиг элементов
------------------------------------------------------------- */
.lastedit,
li#navawards,
#pun-announcement h2,
.punbb-admin #punbb-admain,
#pun-main div.catleft, #pun-main div.catright {display:none!important;}

#pun-about, #pun-crumbs2 {margin-bottom: -100px;}
#pun-crumbs2 {text-align: center;}
.punbb .post-content a {color: #4c5267; border-bottom: 1px dotted;}
.punbb .post-content a:hover {color: #697088; text-decoration: none;}
.post-content td {border: 1px solid #dadada;}