Which CSS property is to be used to set the speed curve of the Animation?

Use the animation-timing-function to set the speed curve of the Animation. You can try to run the following code to set ease and ease-in animation effect:


Live Demo

<!DOCTYPE html>
         div {
            width: 150px;
            height: 200px;
            position: relative;
            background-color: yellow;
            animation-name: myanim;
            animation-duration: 2s;
            animation-direction: alternate-reverse;
            animation-iteration-count: 3;
         @keyframes myanim {
            from {left: 100px;}
            to {left: 200px;}
         #demo1 {animation-timing-function: ease;}
         #demo2 {animation-timing-function: ease-in;}
      <div id = "demo1">ease effect</div>
      <div id = "demo2">ease-in effect</div>