JSFiddle - React, Tailwind, and code Playground

HTML

<a class="dashboard-button" href="#">Menu</a>
<div class="navbar-dashboard">
Item 1<br>Item 2<br>Item 3<br>Item 3<br>
</div>

CSS

.navbar-dashboard {
  display:none;
}
.active {
  display:block;
}

JavaScript

$(".dashboard-button").click(function(){
    if ($(".navbar-dashboard").hasClass("active")) {
        $(".navbar-dashboard").removeClass("active");
    } else {
        $(".navbar-dashboard").addClass("active");
    }
});