When working with Oracle cascading style sheets:
Before making changes, copy the original version and make it easily accessible.
Styles for products requiring unique styles are in productname.css.
Some user interface controls are components of third-party technologies. Changing styles of third-party controls requires changing all associated files.
Avoid making changes to styles that affect layout, including Padding, Borders, Text and Vertical Align, Position, and White-space.
Changing color affects font color. Changing background affects the color of elements such as buttons.
To change hyperlink text color, use the hyperlink style (a:link, a:hover, and a:visited).
Toolbar button changes may require changes to all buttons in the product.
Toolbar buttons rely on a dark-blue background to display properly.