MediaWiki:Common.css

/* CSS placed here will be applied to all skins */

H2 {
font-weight:bold;
border-bottom: 2px solid #AAA;
}

.mw-highlight, .mw-highlight pre {
    padding: 2px;
    margin: 2px;
    border: none;
    vertical-align: top;
    /* Additional resets if needed */
}

.hljs {
    padding: 1px !important; /* Reduce padding */
    margin: 1px 0 !important; /* Adjust margins */
}
pre.hljs {
    margin: 0; /* Internal margin */
}