Understanding the Makeup of a Control on a Fluid Page
A basic input page control consists of two items:
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The control.
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The label.
The system considers the control and the label pairing as a single unit and presents them within a single container in the HTML—ps_box-<control_type>.
For example, in the case of an edit box, the system generated this structure in the HTML.
This example illustrates the appearance of the HTML used to display a page control.

The system generates default styles, which are styled through the style sheets. Applications can override or extend style by adding additional styles or replacing the top-level system default style. In the case of the example above, the application change chose to override the PeopleTools-provided style and it would remove the ps_box-edit class only in favor of the specified class from the application definition.