body {
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
    background-color: gray;
    font-family: sans-serif;
}

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: ##4bd6f2;
}

li {
    float: left;
}

li a {
    display: block;
    color: black;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

li a:hover {
    background-color: #128aed;
}