static __createGlobalStyleNode() {
    const styleTag = document.createElement('style');
    styleTag.setAttribute('data-overlays', '');
    styleTag.textContent = /** @type {CSSResult} */ (overlayDocumentStyle).cssText;
    document.head.appendChild(styleTag);
    return styleTag;
  }
`OverlaysManager` which manages overlays which are rendered into the body