body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.vertical-menu {
    width: 300px;
    height: auto;
}

.vertical-menu a {
    display: block;
    background-color: #333;
    text-decoration: none;
    color: #fff;
    padding: 10px;
}

.vertical-menu a:hover {
    background-color: #0081cb;
}