Technical specification: Blue and white are good book covers. Blue and white are suitable as the cover colors of technical books, because blue is usually considered as the representative color of technical and professional categories, while white, as a fresh and clean color, can better highlight the professionalism and practicality of technical specifications. In addition, the combination of blue and white is also very comfortable, which can make readers feel comfortable and relaxed visually and help to improve readers' acceptance and understanding of technical specifications.