body {
    margin: 0;
    padding: 0;
    height: 100vh;
    display: -webkit-box;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
            flex-direction: column;
    -webkit-box-pack: center;
            justify-content: center;
    font-family: Arial, Helvetica, sans-serif;
}
.intro {
    text-align: center;
}
.intro a {
    color: #a1d117;
}