JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content">Выделим этот элемент</div>
<div>fdvfdgfdsgg</div>
<div>5555555555</div>
<div>hhhhhhhhhhhh</div>
<div>fdvfdgfdsgg</div>

<script>
  var elements = document.getElementsByTagName('div');

  elements.style.background = 'green';
  

  

  
</script>