body{font:16px system-ui;background:#f5f5f5;color:#111;margin:0}main{max-width:360px;margin:15vh auto;padding:24px;background:white;border:1px solid #ccc;border-radius:12px}h1{font-size:24px}label,input,button{display:block;box-sizing:border-box;width:100%}input,button{padding:12px;margin:12px 0}button{background:#222;color:white;border:0;border-radius:6px;cursor:pointer}#error{color:#a00000}