ExtJs 4 example

HTML

<link rel="stylesheet" href="http://dev.sencha.com/deploy/ext-4.0.2a/resources/css/ext-all.css">

CSS

body {
    padding: 50px 20px 0 20px;
}

.some-class {
    text-align: center
}

JavaScript

Ext.onReady(function () {
    Ext.widget('numberfield', {
        renderTo: Ext.getBody(),
        labelAlign: 'top',
        labelSeparator: '',
        fieldLabel: 'Title',
        flex: 1,
        labelClsExtra: 'some-class'
    })
});