Valentine's Day poster background gradient

Quick answer：

Valentine's Day posters often feature a gradient background, which creates a sense of depth and visual appeal. A gradient background is a smooth transition of color from one shade to another. It is commonly used in graphic design to draw attention to elements on the poster and enhance the overall aesthetic. In the context of a 'Qixi' poster, a gradient background could be designed to symbolize the romantic and dreamy atmosphere of the festival, blending traditional Chinese colors with modern design elements.