MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* fixing article fonts to make it look like actual wiki */
body {
    font-size: 16.5px !important;
    line-height: 1.65em !important;
}

/* central body */
.mw-body-content, #mw-content-text {
    font-size: 1.1em !important;
}

/* headers */
h1 { font-size: 2em !important; }
h2 { font-size: 1.65em !important; border-bottom: 1px solid #a2a9b1 !important; }
h3 { font-size: 1.35em !important; }

/* infoboxes */
#mw-panel, .portal, #p-navigation, .infobox {
    font-size: 0.95em !important;
}