2018 UI design color

Quick answer：

In 2018, the color trends in UI design were characterized by the use of muted, natural tones with a focus on earthy colors such as olive, sage, and mustard. There was also a rise in vibrant colors like fuchsia and chartreuse, as well as the popularity of gradient effects. These colors were chosen to create a sense of calmness and approachability, while also adding visual interest and contrast.