MediaWiki:Gadget-collapsibleH2.css

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h2 button {
  all: inherit;
  border: 0;
  display: flex;
  justify-content: space-between;
  width: 100%;
  padding: 0.5em 0;
}


h2 button:focus svg {
  outline: 2px solid;
}


h2 button svg {
  height: 1em;
  margin-left: 0.5em;
}

[aria-expanded="true"] .vert {
  display: none;
}

[aria-expanded] rect {
  fill: currentColor;
}