body {
    font: 14px sans-serif;
    margin: 0;
    padding: 0;
}

ul.menu a {
    color: white;
    text-decoration: none;
    display: block;
    width: 100%;
}
ul.menu,
ul.menu ul {
    background: rgb(128, 128, 128);
    list-style: none;
    padding: 0;
    margin: 0;
    width: 150px;
}
ul.menu ul {
    position: absolute;
    top: 0;
    left: 150px;
    visibility: hidden;
}
ul.menu li {
    position: relative;
    padding: 2px;
}
ul.menu li:hover {
    background: rgb(142, 142, 142);
}
ul.menu li:hover > ul {
    visibility: visible;
}
li.menu > a {
    background: url('arrow.png') no-repeat right;
}