MediaWiki:Common.css

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/* Set border color to burgundy for key sections */
body.page-Main_Page .mw-parser-output,
body.page-Main_Page #content,
body.page-Main_Page .vector-body,
body.page-Main_Page .vector-body .vector-page-titlebar {
    border: 1px solid #800020 !important;
}

/* Update link hover or divider if needed */
body.page-Main_Page hr,
body.page-Main_Page .vector-body .device-section {
    border-color: #800020 !important;
}

/* Change 'Expand / Collapse All' button border and color */
body.page-Main_Page .mw-parser-output .mw-collapsible-toggle {
    border: 2px solid #800020;
    color: #800020;
    font-weight: bold;
}

/* Custom logo image */
#p-logo a {
    background-image: url("/images/your-logo.png") !important; /* change this to your uploaded logo path */
    background-size: contain;
    background-repeat: no-repeat;
}

/* Hide default logo text */
#p-logo a > img {
    opacity: 0;
}