body{margin:0;font-family:system-ui,-apple-system,sans-serif;background:#001d13;color:#eaf5ef}
main{max-width:420px;margin:0 auto;padding:48px 24px;text-align:center}
h1{color:#55f29a;letter-spacing:.04em}
.btn{display:inline-block;margin-top:16px;padding:14px 22px;border-radius:14px;background:#35de74;color:#002a18;font-weight:800;text-decoration:none}