MediaWiki:Common.css

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/* Categories (single star) - Bold and slightly larger */
#vector-main-menu-pinned-container ul > li {
    font-weight: bold;
    font-size: 110%; /* Adjust size */
    color: #000000; /* Change color if needed */
}

/* Subcategories (double star) - Normal size and weight */
#vector-main-menu-pinned-container ul ul li {
    font-weight: normal;
    font-size: 100%; /* Normal size */
    color: #555555; /* Change color if needed */
}