Beautiful flat design colors

Quick answer：

Flat design colors are typically simple, clean, and modern. They often include a limited palette of contrasting or complementary colors to create a sleek and minimalistic look. Popular choices include shades of blue, green, gray, and black, which are often used to convey a sense of professionalism and sleekness. The key to selecting 'beautiful' flat design colors is to balance the color scheme, ensuring that it is both visually appealing and functional for the design's intended purpose.