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: 15px !important;
    line-height: 1.6em !important;
}

/* central text */
.mw-body-content, #mw-content-text {
    font-size: 1.05em !important;
}

/* subheadings */
h1 { font-size: 1.8em !important; }
h2 { font-size: 1.5em !important; }
h3 { font-size: 1.25em !important; }

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