MediaWiki:Common.css

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

#mw-panel #toc {
    position: sticky;
    top: 10px; /* Distance from the top of the viewport */
    max-height: calc(100vh - 20px); /* Prevent overflow */
    overflow-y: auto; /* Enable scrolling for long TOCs */
    background: #f9f9f9;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}