.category-menu {
    list-style: none;
    padding-left: 0;
}

.category-menu > li {
    position: relative;
    margin-bottom: 10px;
}

.category-menu > li > a {
    text-decoration: none;
    font-weight: bold;
    display: block;
    padding: 5px 10px;
    color: #333;
}

.category-menu .submenu {
    list-style: none;
    margin-top: 5px;
    margin-left: 15px;
    display: none;
}

.category-menu li.active .submenu {
    display: block;
}

.category-menu .submenu li {
    margin-bottom: 5px;
}

.category-menu .submenu a {
    text-decoration: none;
    font-weight: normal;
    display: block;
    padding: 3px 10px;
    color: #555;
    font-size: 90%;
}