Not really optimized (even not really beautiful) chan.css

4chan.css

body {
 background: none;
 background-color: #222;
 color: #929492;
 font-size:80%;
}

/* General links */
a {
 color: #797;
 text-decoration:none;
}
a:hover {
 color: #9f9;
}
a:visited {
 color: #977;
}

/* Board list */
#boardNavDesktop a {
 color: #797!important;
}
#boardNavDesktop a:visited {
 color: #a88!important;
}
#boardNavDesktop a:hover {
 color: #8f8!important;
}

/* Header */
.boardBanner {
 position:relative;
 width: 100%;
 height: 60px;
}
.boardBanner img {
 position:absolute;
 right:10px;
 top:2px;
 height: 50px!important;
 width: 160px!important;
}
.boardBanner .boardTitle {
 position: absolute;
 left: 20px;
 top: 6px;
}
.boardBanner .boardSubtitle {
 position: absolute;
 left: 20px;
 top: 40px;
}
.abovePostForm {
 display:none;
}
/* Non ad hack lol */
a[target=_blank]:not(h3 a) {
 display:none;
}

/* random other links */
.postNum a, a.quotelink, .nameBlock, .nameBlock a {
 color: #88957a!important;
}

/* stuff */
hr {
 border-color:#454;
}

/* posts */
div.reply {
 background:none!important;
 background-color: #333!important;
 border: 1px solid #444!important;
 border-radius:5px!important;
 box-shadow:0px 0px 6px black!important;
}

div.op .fileThumb img {
 box-shadow:0px 0px 6px black;
}

.sideArrows {
 display:none;
}
.postingMode {
 font-family: Monospace;
 color:#888!important;
 background-color:#444844!important;
 border-top:1px solid #484a48!important;
 border-bottom:1px solid #484a48!important;
}
table.postForm > tbody > tr > td:first-child {
 background-color:transparent;
 border:0px;
 color:#aaa;
 vertical-align:top;
}
.postForm textarea, .postForm input, input[type="file"] {
 background-color:#444;
 border:1px solid #555!important;
 border-radius:2px;
 padding:2px;
 color:#aaa;
 box-shadow:0px 0px 6px black;
 margin:1px;
}
.globalMessage {
 color:#FFD24D!important;
}

/* fix for dropbar navi 
.boardBanner {
 margin-top:30px;
}
div#boardNavMobile {
 background-color:#444!important;
 border-bottom:1px solid #555!important;
 color:#aaa!important;
}
*/ 

#threadWatcher {
 position:fixed!important;
 top:10px!important;
 left:10px!important;
}