html, body { height: 100%; margin: 0; }
body {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #666699;
    color: #fff;
    font-family: "Roboto", system-ui, sans-serif;
    font-weight: 600;
}
h1 { margin: 0; padding: 0 1rem; font-size: clamp(2rem, 6vw, 4rem); font-weight: 600; text-align: center; }