body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    font-family: system-ui, sans-serif;
    background: #f4f4f4;
    color: #222;
}

main {
    max-width: 700px;
    padding: 40px;
}

h1 {
    margin-bottom: 12px;
}