Section 1 - Exercise: The absolute basics
Section 2.0 - Example: Button basics
Section 2.1 - Exercise: The button basics
Section 3.0 - Example: The button basics
Section 3.1 - Exercise: The transition basics
Section 4.0 - Example: Button interactivity
Section 4.1 - Exercise: Button hover and active
Section 4.2 - Exercise: Button hover and active