MediaWiki:Tabber.css

.tabberlive > .tabbertab:not(.tabbertabhide) {
    border: 1px solid #575646;
    background: linear-gradient(to bottom, #31321e, transparent);
    border-top: none;
}

.tabberlive > .tabbernav {
    border-bottom: 1px solid #575646;
}

.tabberlive > .tabbernav > li > a:link,
.tabberlive > .tabbernav > li > a:active,
.tabberlive > .tabbernav > li > a:visited {
    background: rgba(0,0,0,0);
    border: 1px solid #575646;
    border-radius: 5px 5px 0 0;
    color: #60b31b;
}

.tabberlive > .tabbernav > li.tabberactive > a,
.tabberlive > .tabbernav > li.tabberactive > a:hover,
.tabberlive > .tabbernav > li > a:hover {
    background: #31321e;
    border-bottom: 1px solid #31321e;
    color: #60b31b;
}