/*【视频】*/
#cnblogs_post_body .video {
	position: relative;
	padding-bottom: 56.25%;
  /* 16:9 */
	width: 100%;
	height: 0;
	opacity: 1.0;
}

#cnblogs_post_body .video iframe {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	opacity: 1.0;
}
<div class="video">
<iframe src="//player.bilibili.com/player.html?aid=82355394&cid=140907913&page=1" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true"> </iframe>
</div>