How do I use artwork or a solid color on the back cover?

Choose a back-cover background color and a separate spine background color. For a clean, simple design, select solid color. To carry the front artwork across the design, choose one of the faded black-and-white backdrop levels from 10% through 100%.

Lower opacity keeps back-cover text easier to read; higher opacity makes the artwork more prominent. Choose text and background colors with strong contrast, then inspect the full render to make sure the spine and back feel connected to the front.