B站视频

<iframe src="//player.bilibili.com/player.html?aid=番号&
  bvid=BV1GW411g7pF&cid=34534114&page=" width="100%" allowfullscreen="allowfullscreen">
</iframe>

mp4视频

<div style="text-align: center;">
    <video src="/.mp4" controls="controls" width="100%" height="100%">
    </video>
</div>