JSFiddle - React, Tailwind, and code Playground

CSS

button.down {
    color: blue;
}

button {
    background: grey;
    border:0;
    font-size: 20px;
}

JavaScript

$('button').live('mousedown', function(){

    $(this).addClass('down');

}).live('mouseup', function(){   
    $(this).removeClass('down');
});

$('body').append('<button>help</button>');