See https://snippet.webix.com/35fbw66t
When you choose flat, compact, or contrast skins, the boxes to the left of the edit fields show the specified colors. When you choose material or mini, they are all black.
Daniel Ethier
Hello, @dethier
You are right, the color of the boxes stays the default. As a solution, use color: inherit; to override the default color.
Please, check the snippet here: Code Snippet