JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" class="button">hello </a>

CSS

.button {
     font-size: 18px;   
}

.button-clicked {
    font-size: 35px;
}

JavaScript

$(document).ready(function() {
    $('.button').click(function() {
        $(this).addClass('button-clicked');
    });
    
    $('.button-clicked').click(function() {
        $(this).removeClass('button-clicked');
    }); 
});