JSFiddle - React, Tailwind, and code Playground

HTML

<header>
  <button class="hamburger">&#9776;</button>
  <button class="cross">&#735;</button>
</header>
<div class="mobilemenu">
  <ul>
	<a href="#" class="clickham"><li>Test</li></a>
	<a href="#" class="clickham"><li>Test2</li></a>

  </ul>
</div>

CSS

header{
	width:100%; 
	background:#fff;
	height:60px; 
	line-height:60px;
	border-bottom:1px solid #dddddd;
	display:block;
	z-index:99999;
}
.hamburger{
  background:none;
  position:absolute;
  top:0;
  right:0;
  line-height:45px;
  padding:5px 15px 0px 15px;
  color:#000;
  border:0;
  font-size:1.4em;
  font-weight:bold;
  cursor:pointer;
  outline:none;
  z-index:10000000000000;
}
.cross{
  background:none;
  position:absolute;
  top:0px;
  right:0;
  padding:7px 15px 0px 15px;
  color:#000;
  border:0;
  font-size:3em;
  line-height:65px;
  font-weight:bold;
  cursor:pointer;
  outline:none;
  z-index:10000000000000;
}
.mobilemenu{z-index:1000000; font-weight:bold; font-size:0.8em; width:100%; background:#f1f1f1;  position:fixed; text-align:left; font-size:12px;display:none;top:60px;}
.mobilemenu ul {margin: 0; padding: 0; list-style-type: none; list-style-image: none;}
.mobilemenu li {display: block;   padding:8px 0 8px 10px; border-bottom:#dddddd 1px solid;}
.mobilemenu li:hover{   background:#ffffff; }
.mobilemenu ul li a { text-decoration:none;  margin: 0px; color:#666;}
.mobilemenu ul li a:hover {  color: #666; text-decoration:none;}
.mobilemenu a{text-decoration:none; color:#666;}
.mobilemenu a:hover{text-decoration:none; color:#666;}

JavaScript

$( ".cross" ).hide();
$( ".mobilemenu" ).hide();
$( ".hamburger" ).click(function() {
$( ".mobilemenu" ).slideToggle( "slow", function() {
$( ".hamburger" ).hide();
$( ".cross" ).show();
});
});

$( ".cross" ).click(function() {
$( ".mobilemenu" ).slideToggle( "slow", function() {
$( ".cross" ).hide();
$( ".hamburger" ).show();
});
});

$( ".clickham" ).click(function() {
$( ".mobilemenu" ).slideToggle( "slow", function() {
$( ".cross" ).hide();
$( ".hamburger" ).show();
});
});