Contrasting black color for headings and less intense dark gray for the text helps to improve readability.
Classic blue links and soft red for the hover state makes links visible and predictable.
Blue color for primary buttons for greater consistency with links. Black color for secondary buttons allows you build a variety of UI.
All possible states of the UI are in the simple and intuitive color scheme helps to focus the user's attention when creating an interactive UI.
Special color to highlight areas of interaction with the interface. And the white color for all cases.
Harmonious and well-thought-out scheme of gray for a broad range of tasks in the designing of the interface from controls to backgrounds.