MediaWiki:Common.css

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/* Collapsible Sidebar – Icon via span.vector-collapse-icon */

.vector-collapse-icon {
  position: absolute;
  left: 0.35em;
  top: 50%;
  width: 0.85em;
  height: 0.85em;
  transform: translateY(-50%) rotate(0deg);
  transition: transform 150ms ease;
  display: inline-block;
  pointer-events: none; /* Click passes through to heading */
}

.vector-collapsible--expanded > h3 .vector-collapse-icon,
.vector-collapsible--expanded > .vector-menu-heading .vector-collapse-icon {
  transform: translateY(-50%) rotate(180deg);
}

/* Hide collapsed body */
.skin-vector #mw-panel .portal.vector-collapsible--collapsed > .body,
.skin-vector-2022 nav.vector-menu-portal.vector-collapsible--collapsed .vector-menu-content {
  display: none;
}