2018-09-30 22:01:58 +00:00
---
id: 587d78a8367417b2b2512ae5
title: Animate Elements at Variable Rates
challengeType: 0
videoUrl: 'https://scrimba.com/c/cZ89WA4'
2019-08-05 16:17:33 +00:00
forumTopicId: 301040
2021-01-13 02:31:00 +00:00
dashedName: animate-elements-at-variable-rates
2018-09-30 22:01:58 +00:00
---
2020-11-27 18:02:05 +00:00
# --description--
2018-09-30 22:01:58 +00:00
2020-11-27 18:02:05 +00:00
There are a variety of ways to alter the animation rates of similarly animated elements. So far, this has been achieved by applying an `animation-iteration-count` property and setting `@keyframes` rules.
2018-09-30 22:01:58 +00:00
2021-02-01 19:56:07 +00:00
To illustrate, the animation on the right consists of two stars that each decrease in size and opacity at the 20% mark in the `@keyframes` rule, which creates the twinkle animation. You can change the `@keyframes` rule for one of the elements so the stars twinkle at different rates.
2018-09-30 22:01:58 +00:00
2020-11-27 18:02:05 +00:00
# --instructions--
2018-09-30 22:01:58 +00:00
2020-11-27 18:02:05 +00:00
Alter the animation rate for the element with the class name of `star-1` by changing its `@keyframes` rule to 50%.
# --hints--
The `@keyframes` rule for the `star-1` class should be 50%.
2018-09-30 22:01:58 +00:00
2020-11-27 18:02:05 +00:00
```js
assert(code.match(/twinkle-1\s*?{\s*?50%/g));
```
2018-09-30 22:01:58 +00:00
2020-11-27 18:02:05 +00:00
# --seed--
2018-09-30 22:01:58 +00:00
2020-11-27 18:02:05 +00:00
## --seed-contents--
2018-09-30 22:01:58 +00:00
```html
< style >
.stars {
background-color: white;
height: 30px;
width: 30px;
border-radius: 50%;
animation-iteration-count: infinite;
}
.star-1 {
2018-10-08 00:01:53 +00:00
margin-top: 15%;
2018-09-30 22:01:58 +00:00
margin-left: 60%;
animation-name: twinkle-1;
animation-duration: 1s;
}
.star-2 {
margin-top: 25%;
margin-left: 25%;
animation-name: twinkle-2;
animation-duration: 1s;
}
@keyframes twinkle-1 {
20% {
transform: scale(0.5);
opacity: 0.5;
}
}
@keyframes twinkle-2 {
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 >
```
2020-11-27 18:02:05 +00:00
# --solutions--
2018-09-30 22:01:58 +00:00
2019-04-28 18:13:38 +00:00
```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-name: twinkle-1;
animation-duration: 1s;
}
.star-2 {
margin-top: 25%;
margin-left: 25%;
animation-name: twinkle-2;
animation-duration: 1s;
}
@keyframes twinkle-1 {
50% {
transform: scale(0.5);
opacity: 0.5;
}
}
@keyframes twinkle-2 {
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 >
2018-09-30 22:01:58 +00:00
```