JSFiddle - React, Tailwind, and code Playground

HTML

<div id="create_button">кнопка</div>
<div class="block_3" style="display:none;">блок</div>

JavaScript

'use strict';

const create_button = document.getElementById("create_button")
const block_3 = document.querySelector(".block_3")
create_button.onclick =function(){
  block_3.style.display = 'block';
}