JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    First Container
</div>
<div class="container">
    Second Container
</div>

CSS

div.container {
  width: 500px;
  background-color: blue;
  min-height: 200px;   
  color: #fff;
  margin: 15px;
  padding: 15px;
}

JavaScript

$(function() {
    $(".container").hover(
        function() {
            $(this).width($(this).width() + 30);
        }, 
        function() {
            $(this).width($(this).width() - 30);
        }
    );
});