a {
    color: inherit;
}
body {
    background-color: black;
    color: white;
    font-family: -apple-system, helvetica;
    height: 100%;
    line-height: 1.5;
    margin: 0 auto;
    max-width: 350px;
    padding: 0;
    text-align: center;
}
#header {
    font-size: 30px;
    font-weight: 500;
}