body {
    font-family: sans-serif;
    background: #f4f4f4;
    color: #333;
    padding: 2rem;
    text-align: center;
}
.cover {
    width: 300px;
    margin: 1rem auto;
}
a {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    background: #222;
    color: #fff;
    text-decoration: none;
}
a:hover {
    background: #555;
}