.dropdown .dropdown-menu {
    display: none;
    opacity: 0;
    transition: opacity 0.5s;
}

.dropdown:hover .dropdown-menu {
    display: block;
    opacity: 1;
}

.dropdown-submenu {
    position: relative;
}

    .dropdown-submenu .dropdown-submenu-menu {
        position: absolute;
        top: 0;
        left: 100%;
        margin-top: -6px;
        margin-left: 0;
        display: none;
        background-color: #fff;
        border: 1px solid #ddd;
        padding: 5px 0;
    }

    .dropdown-submenu:hover .dropdown-submenu-menu {
        display: block;
    }

    .dropdown-submenu .dropdown-submenu-menu li a {
        padding: 2px 10px;
        float: right;
        display: block;
        margin: 0;
        width: 210px !important;
    }