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---
id: 587d78a8367417b2b2512ae6
title: Animate Multiple Elements at Variable Rates
challengeType: 0
videoUrl: 'https://scrimba.com/c/cnpWZc9'
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forumTopicId: 301042
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---
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# --description--
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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.
# --instructions--
Set the `animation-duration` of the elements with the classes `star-1` , `star-2` , and `star-3` to 1s, 0.9s, and 1.1s, respectively.
# --hints--
The `animation-duration` property for the star with class `star-1` should remain at 1s.
```js
assert($('.star-1').css('animation-duration') == '1s');
```
The `animation-duration` property for the star with class `star-2` should be 0.9s.
```js
assert($('.star-2').css('animation-duration') == '0.9s');
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```
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The `animation-duration` property for the star with class `star-3` should be 1.1s.
```js
assert($('.star-3').css('animation-duration') == '1.1s');
```
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# --seed--
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## --seed-contents--
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```html
< style >
.stars {
background-color: white;
height: 30px;
width: 30px;
border-radius: 50%;
animation-iteration-count: infinite;
}
.star-1 {
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margin-top: 15%;
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margin-left: 60%;
animation-duration: 1s;
animation-name: twinkle;
}
.star-2 {
margin-top: 25%;
margin-left: 25%;
animation-duration: 1s;
animation-name: twinkle;
}
.star-3 {
margin-top: 10%;
margin-left: 50%;
animation-duration: 1s;
animation-name: twinkle;
}
@keyframes twinkle {
20% {
transform: scale(0.5);
opacity: 0.5;
}
}
#back {
position: fixed;
padding: 0;
margin: 0;
top: 0;
left: 0;
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 >
```
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# --solutions--
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```html
< 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: 0;
margin: 0;
top: 0;
left: 0;
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 >
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```