body{
    background-image: url("https://img-baofun.zhhainiao.com/pcwallpaper_ugc/live/0743054cd67c7ffb38d1a1a792128cfe.mp4.jpg");
    background-position: initial;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-origin: initial;
    background-clip: initial;
    height:100%;
    width:100%;
    }