The interaction color must be clear in its execution and consistent in the interface. Calls to action must have sufficient contrast with respect to the background and sufficient visual weight with respect to other components so that the user can identify them effortlessly.

Basics of Hierarchy in Interface Design (UI).Visual hierarchy is the order in which the user process information by importance. In interface design, like in any other form of design, this concept is necessary to be functional at sight. With the correct use of hierarchy, the mind can group and prioritize elements to give them a specific order, which facilitates the understanding of what you want to communicate and the sense of achievement by the user.