FCC---Animate Multiple Elements at Variable Rates---还可以改循环时间，达到不同律动频率的效果

In the previous challenge, you changed the animation rates for two similarly animated elements by altering their @keyframes rules.

You can achieve the same goal by manipulating the animation-duration of multiple elements.

In the animation running in the code editor, there are three "stars" in the sky that twinkle at the same rate on a continuous loop.

To make them twinkle at different rates, you can set the animation-duration property to different values for each element.

练习题目：

In the previous challenge, you changed the animation rates for two similarly animated elements by altering their @keyframes rules.

You can achieve the same goal by manipulating the animation-duration of multiple elements.

In the animation running in the code editor, there are three "stars" in the sky that twinkle at the same rate on a continuous loop. To make them twinkle at different rates, you can set the animation-duration property to different values for each element.

练习代码：

 <style>

   .stars {

     background-color: white;

     height: 30px;

     width: 30px;

     border-radius: 50%;

     animation-iteration-count: infinite;

   }

   .star-1 {

     margin-top: 15%;

     margin-left: 60%;

     animation-duration: 1s;

     animation-name: twinkle;

   }

   .star-2 {

     margin-top: 25%;

     margin-left: 25%;

     animation-duration: 0.9s;

     animation-name: twinkle;

   }

   .star-3 {

     margin-top: 10%;

     margin-left: 50%;

     animation-duration: 1.1s;

     animation-name: twinkle;

   }

   @keyframes twinkle {

     20% {

       transform: scale(0.5);

       opacity: 0.5;

     }

   }

   #back {

     position: fixed;

     padding:;

     margin:;

     top:;

     left:;

     width: 100%;

     height: 100%;

     background: linear-gradient(black, #000099, #66c2ff, #ffcccc, #ffeee6);

   }

 </style>

 <div id="back"></div>

 <div class="star-1 stars"></div>

 <div class="star-2 stars"></div>

 <div class="star-3 stars"></div>

效果如下：

巴特西

FCC---Animate Multiple Elements at Variable Rates---还可以改循环时间，达到不同律动频率的效果

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