*{box-sizing:border-box}body{color:#202020;background:#f5f5f5;margin:0;font-family:Arial,Helvetica,sans-serif}.container{width:min(1100px,90%);margin-left:auto;margin-right:auto}.react-demo{border:1px solid #ccc;border-radius:.75rem;margin-top:2rem;padding:1.5rem}.react-demo button{cursor:pointer;color:#fff;background:#3457d5;border:0;border-radius:.4rem;padding:.65rem 1rem}