<style type="text/css">
body {
background: #FFFFCC !important;
}

#pun {
background: #ABCDEF !important;
}

.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,.punbb .main .container,.punbb .post .container,.punbb .post h3, #pun-stats h2,.punbb .main h1,.punbb .main h2,#pun-title,#pun-title .container,.punbb .modmenu .container,#pun-navlinks .container,.punbb th,.punbb .post h3 span,#pun-main fieldset legend span,.punbb textarea, .punbb .quote-box, .punbb .code-box{
background: transparent none !important;
}
* {
border: none !important;
}
</style>

<style type="text/css"> 
#pun-navlinks {
width: 150px; 
height: 150px; 
margin-top: -250px; 
padding-bottom: 100px;
}
#pun-navlinks li {
display: block;
padding: 0 10px !important;
} 
#pun-title table {
background: green;
height: 250px;
}
</style>

background: #FFFFCC url(Адрес изображения) no-repeat !important;