下面是自适应代码，替换自己的视频链接即可

<div style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; height: auto;">
    <iframe src="//player.bilibili.com/player.html?isOutside=true&aid=756226201&bvid=BV13r4y1M7n5&cid=283726849&p=1"
        scrolling="no"
        border="0"
        frameborder="no"
        framespacing="0"
        allowfullscreen="true"
        style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;"></iframe>
</div>