html {
    color-scheme: light dark;
}

body {
    margin: 0;
    padding: 0;
    box-sizing: content-box;
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: Tahoma, Verdana, Arial, sans-serif;
}

h1 {
    font-size: 5rem;
}