body{font:16px/1.5 -apple-system,system-ui,sans-serif;margin:0;min-height:100vh;display:grid;place-items:center;background:#1F5C3E;color:#fff;text-align:center}
main{padding:24px;max-width:360px}
a.btn{display:inline-block;margin-top:16px;padding:12px 22px;border-radius:12px;background:#fff;color:#1F5C3E;font-weight:600;text-decoration:none}
.err{color:#ffd6d6}