MediaWiki:Gadget-sister-projects.css

div#mw-head .vector-menu-tabs .sister-tab {
    background: none;
}
div#mw-head .vector-menu-tabs .sister-tab a {
    width: 36px;
    text-indent: -9999em;
    vertical-align: middle;
    background: none;
}
div#mw-head .vector-menu-tabs .sister-tab a::before {
    content: "";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-position: center;
    background-repeat: no-repeat;
    background-size: 20px;
}
div#mw-head .vector-menu-tabs #ca-sister-poewiki a::before {
    background-image: url(/images/f/f7/Poewiki_icon.png);
}