/* FULLSCREEN IFRAME STYLE */
  html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
  }
  .cover-iframe {
    position: fixed;
    inset: 0;            /* top:0; right:0; bottom:0; left:0 */
    width: 100vw;
    height: 100vh;
    border: none;
    z-index: 9999;
    display: block;
    background: transparent;
  }
  .cover-iframe::-webkit-scrollbar { display: none; }