JSFiddle - React, Tailwind, and code Playground

HTML

<div>
<div class="dropdown"><span>Rice cakes</span></div> 
<div class="dropdown"><span>Enemies</span>
    <div>
        <ul>
            <li><a href="#">Cyberman</a></li>
            <li><a href="#">Dalek</a></li>
            <li><a href="#">The Master</a></li>
            <li><a href="#">The Rani</a></li>
            <li><a href="#">Adric</a></li>
        </ul>
    </div>
</div>
</div>

CSS

.dropdown
{
    font-size:16px;
    font-weight:400;  
    line-height:50px;
    text-indent:15px;
    padding-right:15px;
    vertical-align:middle;
    display:inline-block;
    color:black;
    border-right: black;
    float: left;
}

.arrow_padding
{
    padding-right:30px;
}

.icoUp
{
    background-image: url(../images/arrow_up.png);
    background-repeat:no-repeat;
}

.icoDown
{
    background-image: url(../images/arrow_down.png);
    background-repeat:no-repeat;
}

.dropdown:hover
{
   background-color:red;
   color:blue;
   cursor:pointer;
}

.dropdown div { 
    display: none; 
    border:black;
    position:absolute;
    background-color:white;    
} 

.dropdown ul
{
    list-style-type:none;
    margin:0;
    padding:0;
    float:left; 
}

.dropdown a
{
    display:block;
    padding-right:15px;
}

.dropdown li a
{
    display:block; 
    padding-right:15px;  
    line-height:30px; 
}

.dropdown div li:hover
{
    background-color:blue;
}

.dropdown a:active
{
    background-color:red;
    border-color:black;
    color:red;
}

.dropdown ul li ul
{
    float:right;
}

JavaScript

$('.dropdown').mouseenter(function () { // Show the dropdown.
                if ($(this).find('li').length) {
                    $(this).children('div').slideToggle(160);
                }
            });
            $('.dropdown').mouseleave(function () { // Hide the dropdown.
                if ($(this).find('li').length) {
                    $(this).children('div').slideToggle(160);
                }
            });