.hexo-reveal-embed {
  box-sizing: border-box;
  position: relative;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  margin: 1.5rem 0;
}

.hexo-reveal-embed iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}