JSFiddle - React, Tailwind, and code Playground

HTML

<img class="smaller" id='myimg' src="http://upload.wikimedia.org/wikipedia/commons/thumb/2/26/YellowLabradorLooking_new.jpg/260px-YellowLabradorLooking_new.jpg">

CSS

.smaller{
    width:50px;
    height:50px;
}

.bigger{
   
        width:250px;
    height:250px;
}

JavaScript

$(document.body).on('click', '#myimg', function() {
            
            $('img').toggleClass('bigger');
            //$('.bigger').toggle();
            
        });