body {
    background-color: black;
    color: white;
}

h1 {
    font-size: 3rem;
    line-height: 1;
    width: 100%;
    text-align: center;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

@media only screen and (max-width: 600px) {
    h1 {
        font-size: 2.25rem;
        line-height: 2.25rem;
    }
  }