html,body{margin:0;min-height:100%;background:#fff;color:#111}main{min-height:100vh;min-height:100dvh;display:grid;place-items:center}button{font:16px system-ui,sans-serif;color:#111;background:#fff;border:1px solid #ccc;border-radius:6px;padding:12px 28px;cursor:pointer}button:hover{background:#f7f7f7}button:focus-visible{outline:2px solid #111;outline-offset:4px}