JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://cdn.sencha.io/ext-4.0.7-gpl/resources/css/ext-all.css">

JavaScript

Ext.create('Ext.container.Viewport', {
    
    layout: {
        header: false,
        type: 'border',
        padding: 0
    },
    items: [{
            region: 'north',
            padding: '0 150 0 150',
            height: 36,
            html: 'header'
        }, {
            id:'mainPanelContainer',
            autoScroll: true,
            padding: '0 150 0 150',
            region: 'center',
            items:[
                {
                    xtype:'form',
                    items:[{
                        xtype: 'container',
                        flex: 1,
                        layout: 'anchor',
                        items: [{
                            xtype: 'textfield',
                            fieldLabel: 'Name',
                            name: 'Name'
                        }, {
                            xtype: 'textfield',
                            fieldLabel: 'Name',
                            name: 'Name'
                        }, {
                            anchor: '95%',
                            xtype: 'htmleditor',
                            fieldLabel: 'Popis',
                            name: 'Description',
                            height: 240,
                            width: 450
                        }]
                    }, {
                        xtype: 'container',
                        flex: 1,
                        layout: 'anchor',
                        items: [{
                            xtype: 'textfield',
                            fieldLabel: 'Name',
                            name: 'Name'
                        }, {
                            xtype: 'textfield',
                            fieldLabel: 'Name',
                            name: 'Name'
                        }, {
                            xtype: 'textfield',
                            fieldLabel: 'Name',
                            name: 'Name'
                        }, {
                           ...