Having a solid understanding of the CSS foundation in DNN will help to speed up the process of building and troubleshooting for DNN websites. The following are common CSS selectors that can be used in module and skin development.

CSS Selector	Description & Usage
.dnnForm	use as wrapper to allow form elements to inherit from jQuery CSS scope
.dnnFormItem	similar to a table row, .dnnFormItem allows to separate a row of form items. It is often being used to wrap a label and a input (or label and group of inputs)
.dnnLeft	float elements to the left
.dnnRight	float elements to the right
.dnnClear	clear fix for floating elements
.dnnPrimaryAction	used to display button as a primary action (used with hyperlink by itself or within a list item)
.dnnSecondaryAction	display a link as secondary action