/* Overlay message (hidden by default) */
    #webpagesize {
      display: none;
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: black;
      color: red;
      font-size: 40px;
      font-weight: bold;
      text-align: center;
      justify-content: center;
      align-items: center;
      z-index: 9999;
    }