* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
}
ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: hsl(163, 80%, 55%);
}
ul li {
    float: left;
}
ul li a {
    display: block;
    color: black;
    text-align: center;
    width: 100%;
    padding: 16px 30px;
    text-decoration: none;
}
ul li a:hover {
    background-color: hsl(168, 66%, 45%);
}

footer {
    clear: both;
    text-align: center;
    font-family: sans-serif;
    background-color: hsl(163, 80%, 54%);
    padding: 10px 0;
    color: black;
    position: fixed;
    bottom: 0;
    width: 100%;
}