body {
    height: 100vh;
    margin: 0;

    background-color: black;

    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

h1, h2, h3 {
    text-align: center;
    text-transform: uppercase;
    color: aliceblue;
}

@media screen and ( min-width: 768px ) {
    h1 {
        font-size: 6em;
    }
}
@media screen and ( min-width: 992px ) {
    h1 {
        font-size: 9em;
    }
}