.qrcode-wrapper{position:fixed;top:0;bottom:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,.5)}.qrcode-wrapper .qrcode{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:300px;height:300px;background-color:#fff;border-radius:10px;box-shadow:0 0 10px rgba(0,0,0,.1)}