#content {
    max-width: 1200px;
    margin: 0 auto;
    
}

h1 {
    text-align: center;
    
}

a {
    color: black;
    font-size: 1.5em;
    padding: 15px;
    margin: 20px;
    background-color: gray;
}

a:hover {
    color: blue;
}