@graphiql/react/src/ui/dialog.css

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.graphiql-dialog-overlay {
  position: fixed;
  inset: 0;
  background-color: hsla(var(--color-neutral), var(--alpha-background-heavy));
  /**
   * CodeMirror has a `z-index` set for the container of the scrollbar of the
   * editor, so we have to add one here to make sure that the dialog is shown
   * above the editor scrollbar (if they are visible).
   */
  z-index: 10;
}

.graphiql-dialog {
  background-color: hsl(var(--color-base));
  border: var(--popover-border);
  border-radius: var(--border-radius-12);
  box-shadow: var(--popover-box-shadow);
  margin: 0;
  max-height: 80vh;
  max-width: 80vw;
  overflow: auto;
  padding: 0;
  width: unset;
  transform: translate(-50%, -50%);
  top: 50%;
  left: 50%;
  position: fixed;
  z-index: 10;
}

.graphiql-dialog-close > svg {
  color: hsla(var(--color-neutral), var(--alpha-secondary));
  display: block;
  height: var(--px-12);
  padding: var(--px-12);
  width: var(--px-12);
}