JSFiddle - React, Tailwind, and code Playground
HTML
<button class="open">Open Menu</button>
<nav style="display: none">
<a href="">1</a>
<a href="">2</a>
<a href="">3</a>
<a href="">4</a>
<a href="">5</a>
</nav>
CSS
.mobileopen { display: block !important; }
JavaScript
jQuery(".open").click(function() {
jQuery("nav").toggleClass("mobileopen");
var text = $(this).text() == 'Close Menu' ? 'Open Menu' : 'Close Menu';
jQuery(this).text(text);
});