一、实例

二、后台外观

在开发者设置中自定义 CSS里添加下面内容

/*视频挂载*/

.iframe_video {
    position: relative;
    width: 100%;
}

@media only screen and (max-width: 767px) {
    .iframe_video {
        height: 15em;
    }
}

@media only screen and (min-width: 768px) and (max-width: 991px) {
    .iframe_video {
        height: 20em;
    }
}

@media only screen and (min-width: 992px) and (max-width: 1199px) {
    .iframe_video {
        height: 30em;
    }
}

@media only screen and (min-width: 1200px) {
    .iframe_video {
        height: 40em;
    }
}

.iframe_cross {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 75%
}

.iframe_cross iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0
}

三、B站复制嵌入代码

在复制的代码加入class="iframe_video"

<iframe class="iframe_video" src="//player.bilibili.com/player.html?aid=570597681&bvid=BV1rz4y1Y7ej&cid=1114473192&page=1" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true"> </iframe>

四、最终效果