JSFiddle - React, Tailwind, and code Playground

HTML

<button id="click">
  TestMe
</button>
<div class="example">
  Hello
</div>

CSS

.example {
  background-color: white;
  width: 50%;
  transition: width .5s ease;
}

.example.notransition {
  transition: none !important;
}

JavaScript

var ex = $(".example").first();

$("#click").click(function() {
  ex.addClass("notransition")
    .width("100%")
    .removeClass("notransition");
})