methods of color matching in flat design

Quick answer：

Flat design color matching involves selecting a color palette that complements the overall design theme. This typically includes using a primary color, a secondary color, and an accent color. Key principles include harmony, contrast, and repetition. Harmonious colors are those that go well together, such as complementary colors or analogous colors. Contrast ensures the design is visually appealing, and repetition helps establish a cohesive look.