body {
    margin: 0;
    overflow: hidden;
}

.hidden
{
    display: none;
}

#directory-listing {
    background: skyblue;
}

#directory-listing a {
    display: block;
    height: 20px;
    padding-left: 5px;
}

#directory-listing a:nth-child(2n) {
    background-color: whitesmoke;
}