MediaWiki:Vector.css

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/* All CSS here will be loaded for users of the Vector skin */

.sidebar-toc {
    padding: 10px;
    background-color: #f9f9f9;
    border: 1px solid #ccc;
    border-radius: 4px;
    margin-top: 10px;
}
.sidebar-toc ul {
    list-style: none;
    padding-left: 0;
}
.sidebar-toc ul li {
    margin-left: 0;
    padding: 5px 0;
}

.sidebar-toc {
    position: sticky;
    top: 10px; /* Adjust as needed */
    max-height: calc(100vh - 20px);
    overflow-y: auto;
}