body {
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    font-size: xx-large;
    background-image: url(https://previews.123rf.com/images/martinm303/martinm3031706/martinm303170600032/79796820-roman-colosseum-after-sunset-in-colorful-long-exposure-rome-italy.jpg);
    background-repeat: no-repeat;
    background-size: cover;
}
ul li {
    list-style: none;
}
ul li a {
    color: black;
}