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<style>
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.video-container {
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  position: relative;
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  padding-bottom: 56.25%;
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  height: 0;
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  overflow: hidden;
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}
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.video-container iframe {
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  position: absolute;
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  top: 0;
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  left: 0;
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  width: 100%;
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  height: 100%;
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}
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</style>
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<div class="video-container">
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  <iframe
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    src="//player.bilibili.com/player.html?bvid=BV1EZ4y1o74Z&page=1&high_quality=1&autoplay=false"
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    scrolling="no"
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    border="0"
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    frameborder="no"
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    framespacing="0"
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    allowfullscreen="true"
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  >
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  </iframe>
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</div>