@supports (--custom:property) {
  .glomex-embed-iframe{position: relative;}
  .glomex-embed-iframe::before{content: "";display: block;padding-bottom: calc(100% / (var(--aspect-ratio)));}
  .glomex-embed-iframe > :first-child {position: absolute;top: 0;left: 0;height: 100%;margin-bottom: 24px;margin-top: 0px;}
}