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We can also change the tab and select one of the letters—each one representing a color swatch (Figure 7-4). Every color swatch can be customized with:
Header/footer bar color, shadow, and background
Content body colors and borders
Button colors and borders in normal, hover, and pressed states
Using the + tab we can add new color swatches to the theme.
Figure 7-4. Every letter has its own declaration of colors, effects, and backgrounds for toolbars, content, and buttons
When you are defining a background color you will see a little slider. If you move that slider you are changing the gradient, and you will have a live preview at the right. If you click on the little plus icon to the right of the slider, you will get a deeper gradient configuration.