.device-tree-main-box{text-align:left}.device-online{color:#252525}.device-offline{color:#727272}.page-header{background-color:#fff;margin-bottom:1rem;padding:.5rem;display:flex;justify-content:space-between;align-items:center}.page-title{font-weight:700;text-align:left}.page-header-btn{text-align:right}.videoList{display:flex;flex-wrap:wrap;align-content:flex-start}.video-item{position:relative;width:15rem;height:10rem;margin-right:1rem;background-color:#000}.video-item-img{width:100%;height:100%}.video-item-img,.video-item-img:after{position:absolute;top:0;bottom:0;left:0;right:0;margin:auto}.video-item-img:after{content:"";display:inline-block;z-index:2;width:3rem;height:3rem;background-image:url(../img/loading.06886141.png);background-size:cover;background-color:#000}.video-item-title{position:absolute;bottom:0;color:#000;background-color:#fff;line-height:1.5rem;padding:.3rem;width:14.4rem}