main{position:relative}.bv-video-wrap{width:100%;height:100%;display:none}.bv-video-wrap--ready{display:block}.bv-video-wrap::before{content:'';position:absolute;height:100%;width:100%;top:0;right:0;left:0;bottom:0;background:rgba(0,0,0,0.5)}.bv-video{width:100%;height:100%}