html,body{height:100%}body{margin:0;display:flex;flex-direction:column;font-family:Verdana,Geneva,Tahoma,sans-serif;justify-content:center;align-items:center;color:#fff;background:#000}h1{margin-top:0}canvas{display:block;width:80dvmin;height:80dvmin;border:2px solid rgba(255 255 255 / .2);border-radius:4%}