JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <ul>
        <li><a href="#">=</a>

            <ul>
                <li><a href="#">one</a>
                </li>
                <li><a href="#">two</a>
                </li>
                <li><a href="#">three</a>
                </li>
            </ul>
        </li>
    </ul>
</div>

CSS

div {
    background: #999999;
    height: 40px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 15px;
    color: #000000;
    margin: -8px;
    width:100%;
    position:fixed;
    bottom:0px;
}

ul, li, a {
    margin: 0;
    padding: 0;
}
li {
    list-style: none;
}
a {
    text-decoration: none;
    color: #000000;
}

ul > li {
    float: right;
}
ul > li a {
    color: #fff;
    font-weight: bold;
    line-height: 40px;
    height:40px;
    display:block;
    padding:0px 10px;
}
ul li a:hover {
    background: #666666;
}
ul li ul {
    display: none;
    position: absolute;
    background: #333333;
    bottom:40px;
    width: 200px;
    right: 0px;
}
ul li ul li {
    float: none;
    line-height: 40px;
    height: 40px;
}

JavaScript

$(document).ready(function () {
    $("li").click(function () {
        $('li > ul').not($(this).children("ul").toggle()).hide();
        
    });
});