Jawab:
Silahkan login sebagai Administrator ke forum anda.  Kemudian buka halaman .../admin_style.php. Selanjutnya, masukkan kode desain custom style editan anda di 2 kolom yang telah disediakan: Structure style.css dan Colors style_cs.css.

Catatan:
Anda tidak perlu takut salah atau apapun, kapanpun anda bisa kembali ke template standar terakhir yang anda gunakan. Hanya dengan  mencenteng NO pada halaman Custom Style dan mengklik SAVE Rubah.

Jika anda seorang webmaster atau hobi mengotak-atik template seperti blogger, dll, di sini pun anda bisa melakukannya. Anda bisa mempelajari dan men-design custom style template forum melalui 2 contoh kode standar berikut ini:

Structure style.css

Code:
/*************************************************************
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 {
  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: 30px;
  position: relative;
  }

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

/* A5.3 */
#pun-redirect, #pun-maint {
  margin: 50px 20% 12px 20%;
  width: auto;
  float: 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-main h2, #pun-stats h2, #pun-debug h2 {
  padding: 0.5em 1em;
  border-style: none solid solid none;
  border-width: 0 1px 1px 0;
  }


/*************************************************************
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-style: solid;
  border-width: 1px;
  }

/* 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: 50%;
  }

/* C2.2 */
.punbb .main .tc2, .punbb .main .tc3, .punbb .main .tcmod {
  text-align: center;
  width: 10%;
  }

/* 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;
  }

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

/* C2.14 */
.punbb tbody.hasicon td.tcl {
  padding-left: 3.2em
  }

/* C2.15 */
.punbb div.icon {
  border-style: solid;
  border-width: 0.6em 0.6em 0.6em 0.6em;
  height: 0;
  line-height: 0.0;
  margin-top: 0.1em;
  width: 0;
  }

/* C2.16 */
.punbb  table div.icon {
  font-size: 1.05em;
  position: absolute;
  margin-left: -2.2em;
  }

 /* C3 Berita
-------------------------------------------------------------*/

/* 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%;
  }

/* C3.7 */
.pa-author {
  font-size: 1.1em;
  font-weight: bold;
  }

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

/* C3.9 */
li.pa-title {
  padding-bottom: 0.4em;
  font-weight: bold;
  }


li.pa-online {
  line-height: 0.8em;
  border-left-style: solid;
  border-left-width: 0.7em;
  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 : 40px;
  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 {
	border: none;
	height: 40px;
	width: 100%;
}

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

#pun-title td.title-logo-tdr {
	border: none;
	width: 468px;
}

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

/* D2.1 */
#pun-pagelinks {
  position: absolute;
  top: -15px;
  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;
  margin: 0;
  }

/* D3.2 */
#pun-navlinks .container {
  padding: 0.7em 1em;
  }

/* D.3 */
#pun-navlinks li {
  display: inline;
  padding-right: 1em;
  }

/* D3.4 */
#pun-navlinks li a {
  font-size: 1.1em;
  }

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

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

/* D4.2 */
#pun-ulinks .container {
  border-top: none;
  padding: 0.7em 1em;
  }

/* D4.3 */
#pun-ulinks li, #pun-ulinks li a {
  display: inline;
  border-left-style: solid;
  border-left-width: 1px;
  white-space: nowrap;
  }

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

/* 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: 0 1em -3.5em 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: 4.3em 1em 1em 1em;
  }

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

/* D7.1 */
#pun-stats .container {
  padding: 0.8em 1em
  }

/* 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: 1em;
  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: 0.7em 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: 0;
  }

/* D8.4 */
#pun-about .container {
  border-top-style: none;
  text-align: right;
  line-height: 150%;
  padding: 0.8em 1em;
  }

/* D8.5 */
#pun-about p span {
  display:block;
  padding-left: 50%;
  }

/* 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;
  }

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Colors style_cs.css

Code:
/* 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: #f1f1f1;
  color: #333;
  }

/* CS1.2 */
.punbb .main .container, .punbb .post .container, .punbb .post h3, .punbb-admin #pun-admain .adcontainer {
  background-color: #f7f7f7;
  color: #333;
  }

/* CS1.3 */
#pun-stats h2, .punbb .main h1, .punbb .main h2, #pun-debug h2, .punbb-admin #pun-admain h2 {
  background-color: #1474C3;
  color: #fff;
  }

/* CS1.4 */
#pun-title, #pun-title .container, .punbb .modmenu .container {
  background-color: #E1EDF7;
  color: #333;
  }

/* CS1.5 */
.punbb legend span, #viewprofile h2 span, #profilenav h2 span, .punbb-admin #pun-admain legend span {
  background-color: #f7f7f7;
  color: #005EAB
  }

/* CS1.6 */
.punbb .post h3 span, .punbb th, #viewprofile li, #setmods dl  {
  background-color: #dedfdf;
  color: #333
  }

/* CS1.7 */
.punbb .quote-box, .punbb .code-box {
  background-color: #f9f9f9;
  color: #333
  }

/* CS1.8 */
#pun-navlinks .container {
  background-color: #0F5995;
  color: #f1f1f1;
  }

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

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

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

/* CS2.2 */
.punbb .section, .punbb .forum, .punbb .formal, .punbb .modmenu, .punbb .info,
.punbb .category, .punbb .post {
  border-color: #f5f5f5
  }

/* CS2.3 */
#pun-stats h2, .punbb .main h1, .punbb .main h2, #pun-debug h2, .punbb-admin #pun-admain h2 {
  border-color: #004F90;
  }

/* 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: #C9D6E0;
  }

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

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

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

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

.punbb .divider {
  border-color: #ccc #fff #fff #fff
  }

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

li.pa-online {
  border-left-color: #005EAB;
  }


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

/* CS3.1 */
.punbb a, .punbb a:link, .punbb a:visited,
.punbb-admin #pun-admain a, .punbb-admin #pun-admain a:link, .punbb-admin #punbb-admain a:visited {
  color: #005EAB
  }

.punbb li.isactive a, .punbb li.isactive a:link, .punbb li.isactive a:visited {
  color: #333
  }

/* 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: #B42000;
  }

/* CS3.3 */
#pun-navlinks a {
  color: #eee;
  text-decoration: none
  }

/* CS3.4 */
#pun-navlinks a:hover, #pun-navlinks a:focus, #pun-navlinks a:active {
  color: #fff;
  text-decoration: underline
  }

#pun-pagelinks a:active, #pun-pagelinks a:focus {
  background-color: #333;
  color: #fff;
  }

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

div.icon {border-color: #E6E6E6 #DEDEDE #DADADA #E2E2E2}
tr.iredirect div.icon {border-color: #F7F7F7 #F7F7F7 #F7F7F7 #f7f7f7}
div.inew {border-color: #0080D7 #0065C0 #0058B3 #0072CA}

#pun-main div.catleft, #pun-main div.catright {display: none}

Selain via custom style di atas, sebaiknya anda juga memanfaatkan beberapa tempat lainnya untuk mempercantik penampilan forum anda, antara lain melalui halaman .../admin_options.php. Tersedia beberapa kolom untuk memasukkan kode design widget, css, kode js pihak ketiga, dll. Antara lain yaitu:

» HTML Header (Kode akan berefek pada seluruh halaman forum)
» HTML Footer (efek kode berlaku utk semua halaman forum, dll)
» Announcement (Efek kode bisa utk semua halaman)
» Form of reply (Efek hanya terlihat pada member yang login di halaman reply dan buat postingan baru)

Contoh penerapan:
Anda bisa memasukkan kode html iklan banner atau kode-kode widget pihak ketiga di salah satu kolom option tersebut.