.scan{height:100vh}.scan .back{position:fixed;bottom:0;right:0}.scan #bcid{width:100%;position:absolute;left:0;right:0;top:0;height:calc(100% - .8rem);bottom:3rem;text-align:center;color:#fff}.scan footer{position:absolute;left:0;bottom:0;height:.8rem;background-color:#fff;z-index:2}