/*哔哩哔哩视频适配*/
.aspect-ratio {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 75%;
  margin: 3% auto;
  text-align: center;
}
.aspect-ratio iframe {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
}