MediaWiki:Common.css

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/* Collapse image toggle */
.mw-collapsible-toggle .up,
.mw-customtoggle .up,
.mw-collapsed .mw-collapsible-toggle .down,
.mw-collapsed .mw-customtoggle .down {
 display: none;
}
.mw-collapsible-toggle .down,
.mw-customtoggle .down,
.mw-collapsed  .mw-collapsible-toggle .up,
.mw-collapsed  .mw-customtoggle .up {
 display: block;
}