chromium/chrome/browser/resources/print_preview/ui/more_settings.html

<style include="cr-hidden-style print-preview-shared">
  :host {
    border-top: var(--print-preview-settings-border);
    display: block;
  }

  :host([disabled]) {
    pointer-events: none;
  }

  div {
    align-items: center;
    display: flex;
    font: inherit;
    margin: 0;
    min-height: 48px;
  }

  :host cr-expand-button {
    flex: 1;
    /* Padding here as cr-expand-button has a background on hover. */
    padding-inline-end: calc(var(--print-preview-sidebar-margin) + 6px);
    padding-inline-start: var(--print-preview-sidebar-margin);
    --cr-expand-button-size: 28px;
  }

  :host([hidden]) {
    display: none;
  }

  :host([disabled]) #label {
    opacity: var(--cr-disabled-opacity);
  }
</style>
<div on-click="toggleExpandButton_" actionable>
  <cr-expand-button aria-label="$i18n{moreOptionsLabel}"
      expanded="{{settingsExpandedByUser}}" disabled="[[disabled]]">
    <div id="label">$i18n{moreOptionsLabel}</div>
  </cr-expand-button>
</div>