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:
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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.
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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.