*,:before,:after{box-sizing:border-box}body{color:#111;background:#fff;margin:0;font-family:system-ui,Segoe UI,Roboto,sans-serif}main{flex-direction:column;justify-content:center;align-items:center;gap:1.5rem;min-height:100vh;padding:2rem;display:flex}h1{margin:0;font-size:2.5rem}button{cursor:pointer;color:#fff;background:#5469d4;border:none;border-radius:6px;padding:.6rem 1.4rem;font-size:1rem}button:hover{background:#3d52b5}