JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="thing1">This div</div>
  <input type="text" class="thing2" />
</div>

JavaScript

$(document).ready(function() {
  $('.thing2').hover(function() {
    $('.thing1').css('border', '1px solid red');
 		$('.thing2').mouseleave(function() {
      $('.thing1').css('border', 'none');
    })
  });
});