JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
<a id="button1" title="button1"><i class="fa fa-bluetooth fa-5x"></i></a>
<a id="button2" title="button2"><span id="mytext">large text</span></a>

CSS

a {
    background: #ccc;
    cursor: pointer;
    border-top: solid 2px #eaeaea;
    border-left: solid 2px #eaeaea;
    border-bottom: solid 2px #777;
    border-right: solid 2px #777;
    padding: 5px 5px;           
    }

a.down {
    background: #bbb;
    border-top: solid 2px #777;
    border-left: solid 2px #777;
    border-bottom:solid 2px  #eaeaea;
    border-right: solid 2px #eaeaea;
    }
    
#mytext{
  font-size: 45pt;
}

JavaScript

$(document).ready(function(){
    $('a#button1').click(function(){
        $(this).toggleClass("down");
    });
});