#header {
    position: relative;
    overflow: hidden;
}

#menu {
    width: 100%;
    height: 120px;
    background: #181818;
    list-style: none;
    margin: 0;
    padding: 0;
}

#menu li {
    margin: 0;
    padding: 0;
    float: left;
}

#menu li a {
    color: #FFF;
    margin: 0;
    padding: 50px;
    display: block;
}

#highlight {
    position: absolute;
    top: 0;
    left: 0;
    height: 5px;
    background: #f00;
    transition: all .5s;
}