#popup { display: none; position: fixed; top: 12%; left: 15%; width: 70%; height: 70%; background-color: white; z-index: 10; }
#popup iframe { width: 100%; height: 100%; border: 0; }
#popupdarkbg { position: fixed; z-index: 5; left: 0; top: 0; width: 100%; height: 100%; overflow: hidden; background-color: rgba(0,0,0,.75); display: none; }

.close {
    position: absolute;
    right: 32px;
    top: 32px;
    width: 32px;
    height: 32px;
    opacity: 0.3;
  }
  .close:hover {
    opacity: 1;
  }
  .close:before, .close:after {
    position: absolute;
    left: 15px;
    content: ' ';
    height: 33px;
    width: 2px;
    background-color: #333;
  }
  .close:before {
    transform: rotate(45deg);
  }
  .close:after {
    transform: rotate(-45deg);
  }