MediaWiki:Common.css

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/* Ensure scrollbar is visible above the header */
#mw-navigation {
    z-index: 1000; /* Ensure sidebar appears above other content */
    overflow-y: auto; /* Enable scrolling for the sidebar */
    height: calc(100vh - 56px); /* Adjust height to fit viewport minus header height */
}

/* Style the scrollbar for the sidebar */
#mw-navigation::-webkit-scrollbar {
    width: 8px; /* Width of the scrollbar */
}

#mw-navigation::-webkit-scrollbar-track {
    background: #f1f1f1; /* Color of the scrollbar track */
}

#mw-navigation::-webkit-scrollbar-thumb {
    background: #888; /* Color of the scrollbar thumb */
}

#mw-navigation::-webkit-scrollbar-thumb:hover {
    background: #555; /* Color of the scrollbar thumb on hover */
}