.bili-player {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  margin: 1.5em 0;
  border-radius: 8px;
  overflow: hidden;
  background: #000;
}
.bili-player iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}