ease : specifies a transition effect with a slow start, then fast, then end slowly (this is default). linear : specifies a transition effect with the same speed from start and end. ease-in : specifies a transition effect with a slow start. ease-out : specifies a transition effect with a slow end. ease-in-out : specifies a transition effect with a slow start and end. cubic-bezier(n,n,n,n) - lets you define your own values in a cubic-bezier function.