h1{
    text-align: center;
    margin: 4.0rem auto;
}
ul{
    list-style: none;
}
ul li a{
    display: block;
    margin: 2.0rem auto;
    padding: 1.0em 0;
    width: 80%;
    max-width: 28.0em;
    color: white;
    background-color: black;
    text-align: center;
    text-decoration: none;
}