@graphiql/react/src/toolbar/button.css

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button.graphiql-toolbar-button {
  display: flex;
  align-items: center;
  justify-content: center;
  height: var(--toolbar-width);
  width: var(--toolbar-width);

  &.error {
    background: hsla(var(--color-error), var(--alpha-background-heavy));
  }
}