JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://cdn.sencha.com/ext/gpl/4.2.0/resources/css/ext-all-debug.css">
<h1>
test test
</h1>

JavaScript

Ext.create('Ext.panel.Panel', {
    width: 500,
    height: 300,
    title: 'Border Layout',
    layout: 'border',
    items: [{
        title: 'South Region is resizable',
        region: 'south',     // position for region
        xtype: 'panel',
        height: 100,
        split: true,         // enable resizing
        margins: '0 5 5 5'
    },{
        // xtype: 'panel' implied by default
        title: 'West Region is collapsible',
        region:'west',
        xtype: 'panel',
        margins: '5 0 0 5',
        width: 200,
        collapsible: true,   // make collapsible
        id: 'west-region-container',
        layout: 'fit'
    },{
        title: 'Center Region',
        region: 'center',     // center region is required, no width/height specified
        xtype: 'panel',
        layout: 'fit',
        margins: '5 5 0 0'
    }],
    renderTo: Ext.getBody()
});