JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://dev.sencha.com/deploy/ext-4.1.0-gpl/resources/css/ext-all.css">

JavaScript

Ext.application({
    launch: function() {
        Ext.MessageBox.show({
            title: "",
            msg: "message text",
            icon: Ext.MessageBox.WARNING,
            buttons: Ext.MessageBox.OKCANCEL,
            fn: function(buttonId) {
                if (buttonId === "ok") {
                    alert("Done!")
                }
            }
        });
    }
});