JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text">
<button>Кнопка</button>
<div class="output"></div>

CSS

.output {
  width: 300px;
  height: 100px;
  border: 1px solid #000;
}

JavaScript

let textarea = document.querySelector('input');
let btn = document.querySelector('button');
let output = document.querySelector('.output');


btn.addEventListener('click', () => {output.textContent = textarea.value});