MediaWiki:Common.css

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# Replace the JAVASCRIPT_CODE section with this updated version:

/* Sidebar collapsible sections */
.collapsible-header {
    cursor: pointer;
    font-weight: bold;
    padding: 5px 8px;
    background: #f8f9fa;
    border-radius: 4px;
    margin-bottom: 2px;
}

.collapsible-content {
    display: none;
    margin: 0;
    padding-left: 15px;
}

.collapsible-section.active .collapsible-content {
    display: block;
}