body{height:100vh;margin:0;padding:0}#modelcontainer{border-radius:10px;flex-direction:row;justify-content:center;height:100%;display:flex}#awake3dview{opacity:0;width:100%;height:100%;transition:opacity 2s}#awake3dview.add{opacity:1}#awake3dview.remove{opacity:0}