body {
    margin: 0;
}

nav, nav > ul {
    margin: 0;
    padding: 0;
}

nav > ul {
    list-style-type: none;
    overflow: hidden;
    border: 1px solid #e7e7e7;
    background-color: #f3f3f3;
}

nav > ul > li {
    float: left;
}

nav > ul > li > a {
    display: block;
    padding: 14px 16px;
    text-decoration: none;
    color: #666;
}

nav > ul > li > a.active {
    color:white;
    background-color: #4CAF50;
}

nav > ul > li.right {
    float: right;
}

nav > ul > li > a:hover:not(.active) {
    background-color: #ddd;
}

@media only screen and (max-width: 600px) {
    nav > ul > li, nav > ul > li.right {
        float: none;
    }
}