body
{
   background-color: #FFFFFF;
   color: #000000;
   font-family: Arial;
   font-weight: normal;
   font-size: 16px;
   line-height: 1.1875;
   margin: 0;
   padding: 0;
}
body{font-family:sans-serif;text-align:center;margin:20px}video,canvas{width:100%;max-width:400px;margin-top:1rem;border:1px solid #ccc}#x{white-space:pre-wrap;margin-top:1rem;background:#f8f8f8;padding:1rem;border:1px solid #ccc}button{margin-top:1rem;padding:10px 20px;font-size:16px}