According to the law of proximity, you have to group related elements together to communicate that they form a whole. Roccat's Website uses images and buttons to form a group.
Visual Hierarchy teaches that there is an order in which the human eye perceives what it sees. Gamefly made its "Sign Up Now" button more visual for new users.
Fitt's Law is about the bigger an object and the closer it is, the easier it is to use. Tesla made the buttons “Custom Order” and “Existing Inventory” large enough and in an easy place to see and to visually appeal people.