MediaWiki:Common.css

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/* Ensure sidebar list structure is targeted correctly */
.vector-menu-portal .vector-menu-content-list,
.vector-menu-portal .vector-menu-content-list ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* Hide submenus by default */
.vector-menu-portal .vector-menu-content-list ul {
    display: none;
    margin-left: 1em;
}

/* Collapsible header style */
.vector-menu-portal li.collapsible-header {
    cursor: pointer;
    font-weight: bold;
    position: relative;
    padding-left: 18px;
}

/* Add arrow icon before header */
.vector-menu-portal li.collapsible-header::before {
    content: "\25B6"; /* Unicode triangle ► */
    position: absolute;
    left: 0;
    top: 0;
    font-size: 12px;
    transition: transform 0.2s ease;
}

/* Rotate arrow when open */
.vector-menu-portal li.collapsible-header.open::before {
    transform: rotate(90deg);
}