Theme Design controls the colors, fonts and sizes of each part of Ultra. Open it at AppearanceCustomizeTheme Design.
Theme Design needs Ultra Premium. Free Ultra does not show this panel.
Most settings update the preview as you change them. Hover colors, heights and a few others reload the preview instead. The panel has these sections:
Settings That Repeat
Several sections share the same kinds of setting.
Color Settings
Pick a color with the color picker or type a hex code.
Font Settings
Choose a web-safe font or a Google font. Some fonts list weights, for example Lato (700).
Size Settings
Sizes are in pixels. Enter a number without the unit. Decimals work, for example 37.5.
Background Image Layout
Choose Default, Center, Tile or Cover. Default adds no layout rule. Center places the image in the middle and does not repeat it. Tile repeats the image. Cover scales the image to fill the area. The choice matters only when you set a background image.