MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* Logo */
#p-logo a { background-size: cover; }
.mw-wiki-logo { margin-top: 10px; }
/* Sidebar */
/* Remove Vector's default toggle spacing */
.collapsiblevector {
    padding-left: 0 !important;
}

/* Kill built-in arrow + spacing */
.vector-menu-heading::before,
.vector-menu-heading::after {
    content: none !important;
}
.collapsiblevector .vector-menu-heading {
    padding: 0.5em 0;
    margin-bottom: 0.3em;

    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    font-weight: 600;

    display: flex;
    align-items: center;
}
.collapsiblevector .vector-menu-heading::after {
    content: "▾";
    margin-left: auto;
    opacity: 0.6;
    transition: transform 0.2s ease, opacity 0.2s ease;
}
.collapsiblevector.collapsed .vector-menu-heading::after {
    transform: rotate(-90deg);
    opacity: 0.4;
}
.collapsiblevector .vector-menu-content {
    padding-left: 0;
    margin-left: 0;
}
.collapsiblevector .vector-menu-heading:hover::after {
    opacity: 0.85;
}