JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper-demo">
  <div id="dd" class="wrapper-dropdown-1" tabindex="1">
    <span>Gender</span>
    <ul class="dropdown" tabindex="1">
      <li data-js="m"><a href="#">Male</a></li>
      <li data-js="f"><a href="#">Female</a></li>
    </ul>
  </div>
</div>

CSS

*,
*:after,
*:before {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

body {
  background: #EDEDED; 
}

.wrapper-demo {
    margin: 20px 0 0 0;
}

.wrapper-demo:after {
    clear: both;
    content: "";
    display: table;
}

/* DEMO 1 */

.wrapper-dropdown-1 {
    position: relative;
    width: 200px;
    padding: 10px;
    margin: 0 auto;

    background: #9bc7de;
    color: #fff;
    outline: none;
    cursor: pointer;

    font-family: 'Helvetica', 'Arial', sans-serif;
    font-weight: bold;
}

.wrapper-dropdown-1:after {
    content: "";
    width: 0;
    height: 0;
    position: absolute;
    right: 16px;
    top: 50%;
    margin-top: -6px;
    border-width: 6px 0 6px 6px;
    border-style: solid;
    border-color: transparent #fff;    
}

.wrapper-dropdown-1 .dropdown {
    /* Size & position */
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;

    /* Styles */
    background: #fff;
    list-style: none;
    font-weight: normal; /* Cancels previous font-weight: bold; */

    /* Hiding */
    opacity: 0;
    pointer-events: none;
}

.wrapper-dropdown-1 .dropdown li a {
    display: block;
    text-decoration: none;
    color: #9e9e9e;
    padding: 10px 20px;
}

/* Hover state */
.wrapper-dropdown-1 .dropdown li:hover a {
    background: #f3f8f8;
}

/* Active state */
.wrapper-dropdown-1.active .dropdown {
    opacity: 1;
    pointer-events: auto;
}

.wrapper-dropdown-1.active:after {
    border-color: #9bc7de transparent;
    border-width: 6px 6px 0 6px ;
    margin-top: -3px;
}

.wrapper-dropdown-1.active {
  background: #9bc7de;
  background: -moz-linear-gradient(left,  #9bc7de 0%, #9bc7de 78%, #ffffff 78%, #ffffff 100%);
  background: -webkit-gradient(linear, left top, right top, color-stop(0%,#9bc7de), color-stop(78%,#9bc7de), color-stop(78%,#ffffff), color-stop(100%,#ffffff));
  background: -webkit-linear-gradient(left,  #9bc7de 0%,#9bc7de 78%,#ffffff 78%,#ffffff 100%);
  background: -o-linear-gradient(left,  #9bc7de...

JavaScript

$('.wrapper-demo').on('click', function() {
  $('#dd').toggleClass('active');
});

$('.dropdown > li').on('click', function() {
  var displayVal = $(this).text();
  var realVal = $(this).data('js');
  $('.wrapper-demo span').html('Gender: '+displayVal);
  
  console.log(realVal); //this displays "m" or "f" depending on your choice
});