查看“MediaWiki:Common.css”的源代码

/* 这里放置的CSS将应用于所有皮肤 */
/* Hide main page header */
body.page-index h1.firstHeading {
    display: none;
}
/*视频*/
.newplayer {
    padding-bottom: 80%;
    position: relative;
    width: 100%;
}
.video-player {
    width: 100%;
    position: absolute;
    height: 100%;
} 
/*视频封面*/
.img-video {
    background-size: cover;
    border-radius: 4px;
    display: block;
    width: 160px;
    height: 100px;
    overflow: hidden;
    position: relative;
}