JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <nav>
       <ul class="nav">
            <li><a href="#"></a></li>
            <li class="menuabout"><a>About</a>
                 <ul class="subnav01 clearfix">
                      <li><a href="#">About One</a></li>
                      <li><a href="#">About Two</a></li>
                      <li><a href="#">About Three</a></li>
                      <li><a href="#">About Four</a></li>
                      <li><a href="#">About Five</a></li>
                      <li><a href="#">About Six</a></li>
                 </ul>
            </li>
            <li class="menuproducts"><a>Products</a>
                 <ul class="subnav02 clearfix">
                      <li><a href="#">Product One</a></li>
                      <li><a href="#">Product Two</a></li>
                      <li><a href="#">Product Three</a></li>
                      <li><a href="#">Product Four</a></li>
                      <li><a href="#">Product Five</a></li>
                      <li><a href="#">Product Six</a></li>
                 </ul>
            </li>
            <li><a href="#">Services</a></li>
            <li><a href="#">Contact</a></li>
       </ul>             
    </nav>
</body>

CSS

* {
    margin: 0;
    padding: 0;
}

body {
    width: 100%;
    height: 100%;
    background: darkgray;
}

.nav {
    width: 100px;
    position: absolute;
    top: 30px;
    right: 20px;
    list-style: none;
}

.nav li {
    margin: 0 0 10px 0;
    font-family: Helvetica;
    font-size: 11px;
    text-align: right;
    text-transform: uppercase;
    line-height: 1;
}

.nav li:nth-child(5) {
    margin: 0;
}

.nav li a {
    height: 10px;
    padding: 10px 10px 10px 0;
    color: white;
    text-decoration: none;
    display: block;
    cursor: pointer;
    position: relative;
}

.subnav01, .subnav02 {
    width: 300px;
    position: absolute;
    top: 29px;
    left: -300px;
    display: none;
}
.subnav01 li, .subnav02 li {
    width: 150px;
    margin: 0;
    text-align: center;
    float: left;
}

.subnav01 li a, .subnav02 li a {
    -webkit-transition: all 0.5s ease;
    -moz-transition: all 0.5s ease;
    -ms-transition: all 0.5s ease;
    -o-transition: all 0.5s ease;
    transition: all 0.5s ease;
    background: dodgerblue;
    height: 10px;
    display:block;
}

.subnav01 li a:hover, .subnav02 li a:hover {
    background: dimgray;
}

.clearfix:before,
.clearfix:after {
    content: " "; /* 1 */
    display: table; /* 2 */
}

.clearfix:after {
    clear: both;
}

.active > a {
    background: dodgerblue !important;
}

JavaScript

jQuery(document).ready(function($){
    $(".menuabout").on("click", function(){
        reset();
        $(".subnav01").toggle ("slide", {direction: "down"}, "slow");
        $(this).toggleClass("active");
    });
    $(".menuproducts").on("click", function(){
        reset();
        $(".subnav02").toggle ("slide", {direction: "down"}, "slow");
        $(this).toggleClass("active");
    });
    function reset() {
        $("ul.nav li").removeClass("active");
        $("ul.nav li ul").hide();        
    }
});