Transitions

Hover

:hover change background color

Transition-property & transition-duration

Transition-property:all & transition-duration: 1s

Changes: background-color/color/width

Transition background-color/color/border-radius

transition: ackground-color 3s ease-in-out 1s, color 2s ease 4s, border-radius 4s ease-out 6s;