/* login */
video {object-fit:fill;width:100%;height:100%;} 
.login {height: 260px;width: 260px;padding: 20px;background-color: rgba(0,0,0,0.5);border-radius: 4px;position: absolute;left: 50%;top: 50%;margin: -150px 0 0 -150px;z-index: 99;}
.login h1 {text-align: center;color: #fff;font-size: 24px;margin-bottom: 20px;}
.video_mask {width: 100%;height: 100%;position: absolute;left: 0;top: 0;z-index: 90;background-color: rgba(0,0,0,0.5);}