FCC---Make Motion More Natural Using a Bezier Curve--- juggling movement

This challenge animates an element to replicate the movement of a ball being juggled. Prior challenges covered the linear and ease-out cubic Bezier curves, however neither depicts the juggling movement accurately. You need to customize a Bezier curve for this.

The animation-timing-function automatically loops at every keyframe when the animation-iteration-count is set to infinite. Since there is a keyframe rule set in the middle of the animation duration (at 50%), it results in two identical animation progressions at the upward and downward movement of the ball.

The following cubic Bezier curve simulates a juggling movement:

cubic-bezier(0.3, 0.4, 0.5, 1.6);

Notice that the value of y2 is larger than 1. Although the cubic Bezier curve is mapped on an 1 by 1 coordinate system, and it can only accept x values from 0 to 1, the y value can be set to numbers larger than one. This results in a bouncing movement that is ideal for simulating the juggling ball.

练习题目:

Change value of the animation-timing-function of the element with the id of green to a cubic-bezier function with x1, y1, x2, y2 values set respectively to 0.311, 0.441, 0.444, 1.649.

练习代码：

 <style>
   .balls {
     border-radius: 50%;
     position: fixed;
     width: 50px;
     height: 50px;
     top: 60%;
     animation-name: jump;
     animation-duration: 2s;
     animation-iteration-count: infinite;
   }
   #red {
     background: red;
     left: 25%;
     animation-timing-function: linear;
   }
   #blue {
     background: blue;
     left: 50%;
     animation-timing-function: cubic-bezier(0.311,0.441,0.444,1.649);
   }
   #green {
     background: green;
     left: 75%;
     animation-timing-function: cubic-bezier(0.69, 0.1, 1, 0.1);
   }

   @keyframes jump {
     50% {
       top: 10%;
     }
   }
 </style>
 <div class="balls" id="red"></div>
 <div class="balls" id="blue"></div>
 <div class="balls" id="green"></div>

效果如下：