I reset the CSS code of your forum, so it is working again now. Your previous code is below in case you want to put something back.
.nabble,
.nabble table,
.nabble .info-message th {
color: #ffffff;
}
.nabble a:link,
.nabble a.not-visited-link,
span.dropdown-item {
color: #ffcc66;
}
.nabble a:visited,
.nabble a.visited-link{
color: #ffffcc;
}
.nabble h1,
.nabble .light-black {
color: #eeeeee;
}
.nabble .important {
color: #ffcc33;
}
.nabble th,
.nabble .form-label,
.nabble .weak-color {
color: #cccccc;
}
.nabble .message-text, .small, .nabble .editor-table td, p, form, small, ul, table td, .breadcrumbs {
color:#dddddd;
}
body, .nabble,
img[src='/images/icon_post_message.png'] {
width: 0; height: 0; padding-top: 16px; padding-left: 16px;
background: url('http://www.mw3forumz.com/avatars/admin.gif?dateline=1302485388') no-repeat -112px 0;
}
.nabble .no-bg-color {
background-color: #000000;
}
.nabble .light-bg-color {
background-color: #191919;
}
.nabble .shaded-bg-color {
background-color: #00CD00;
}
.nabble th,
.nabble .dark-bg-color {
background-color: #666666;
}
.nabble .highlight {
background-color: #545500;
}
.nabble .error-message,
.nabble .info-message,
.nabble .light-highlight {
background-color: #631900;
}
.nabble .info-message th,
.nabble .dark-highlight {
background-color: #cc0000;
}
.nabble table,
.nabble li,
.nabble div,
.nabble .medium-border-color {
border-color: #666666;
}
.nabble td,
.nabble .light-border-color {
border-color: #00CD00;
}
.nabble .dark-border-color {
border-color: #cccccc;
}
.nabble .error-message {
border-color: #ffcc33;
}
.nabble .info-message {
border-color: #3366ff;
}
span.dropdown table {
background-color:#333333;
border-color:#6a6a6a;
}
tr.dropdown-hover {
background-color:#111111;
}
.post-border, td.post-border {
border-color: #d9d9d9;
}
span.post-date {
color:#AFAFBB;
}
span.post-author {
color:#6FA669;
}
span.post-subject {
color:#C0BA79;
}
span.post-snippet {
color:#999999;
}
.post-hover {
background-color:#333333;
}
select, input, textarea, button {
color: #eeeeee;
background-color:#222222;
border:1px solid #888888;
}
input[type=radio] {
border:none;
}