MediaWiki:Common.css
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#mw-head::before {
content: "";
display: block;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
width: 45px;
height: 45px;
background-image: url('https://wiki.jcraft-eoe.com/images/7/71/JCraft_Icon.png');
background-size: contain;
background-repeat: no-repeat;
background-position: center;
cursor: pointer;
z-index: 100;
}
#p-logo {
display: block !important;
position: absolute;
left: 50%;
top: 0;
transform: translateX(-50%);
width: 45px;
height: 100%;
z-index: 101;
}
#p-logo a {
display: block;
width: 100%;
height: 100%;
text-indent: -9999px;
}