自定义CSS并引入

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/*哔哩哔哩视频适配*/
.video-bilibili {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 65%;
  margin: 3% auto;
  text-align: center;
}
.video-bilibili iframe {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
}

.video-youtube {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  margin: 3% auto;
}
.video-youtube iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

用法示例

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<div class="video-bilibili">
  <iframe
    src="https://player.bilibili.com/player.html?aid=412679216&&page=1&as_wide=1&high_quality=1&danmaku=0"
    scrolling="no"
    border="0"
    frameborder="no"
    framespacing="0"
    high_quality="1"
    danmaku="1"
    allowfullscreen="true"
  ></iframe>
</div>
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<div class="video-youtube">
<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/76_6dy-lBlA" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
</div>

效果展示

电脑端展示手机端展示
bilibili电脑端bilibili手机端
youtube电脑端youtube手机端