MediaWiki:Gadget-sister-projects.css
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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);
}