A style sheet (.CSS cascading style sheet) defining the basic stylistic aspects of a design them, such as the fonts, colors, and table styles.  There are two ways to change a design theme’s look and feel:

• Modify the class definitions within the style sheet.  This is the easiest way to modify a design theme and works best when you want to make global cosmetic changes.

• Modify the design theme’s look and feel by changing the HTML within the various panel files themselves.  This works best for very specific changes to an individual panel file.