body{margin:0;padding:0;overflow:hidden;background:#000}#app{width:100vw;height:100vh;display:flex;justify-content:center;align-items:center;position:relative}#crosshair{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:none;z-index:999}.crosshair-line{background-color:#fffc;position:absolute}.crosshair-horizontal{width:20px;height:2px;top:50%;left:50%;transform:translate(-50%,-50%)}.crosshair-vertical{width:2px;height:20px;top:50%;left:50%;transform:translate(-50%,-50%)}