JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/dojo/1.6.1/dijit/themes/claro/claro.css">

CSS

.paddedButton.dijitButton .dijitButtonNode{
    padding: 1px;
}

JavaScript

//See
//http://stackoverflow.com/questions/7799866/how-can-i-change-the-size-of-a-dojo-button-without-styling-the-text

dojo.require('dijit.form.Button');

var b;
dojo.ready(function(){
    //Setting the claro class now since I don't know
    //how to edit the body tag here in JSFiddle...
    dojo.addClass(dojo.body(), 'claro');
    
    b = new dijit.form.Button({
        label: 'Hello World',
        'class': 'paddedButton',
        'iconClass': 'dijitEditorIcon dijitEditorIconUndo'
    });
    b.placeAt(dojo.body());
});