JSFiddle - React, Tailwind, and code Playground

HTML

<button class="swarm">Zergling</button>

JavaScript

document.body.onclick = function (event){
    if(event.target.className = 'Swarm') {
        //Add Zerling
        var button = document.createElement('button');
        button.className = 'Swarm';
        button.textContent = 'Zergling';
        document.body.appendChild(button);
    }
};