jQuery addClass example

Change class name on click in jQuery

HTML

<div class="section"></div>

CSS

body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  width: 100vw;
  margin: 0;
}

.section {
  width: 40px;
  height: 60px;
  background-color: #0084ff;
  transition: 250ms;
}

.section.scale {
  width: 50px;
  height: 70px;
}

JavaScript

$('.section').on("click", function(){
  $(this).toggleClass("scale")
})