142 lines
2.8 KiB
Markdown
142 lines
2.8 KiB
Markdown
---
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id: 587d78a8367417b2b2512ae5
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title: Animate Elements at Variable Rates
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cZ89WA4'
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forumTopicId: 301040
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dashedName: animate-elements-at-variable-rates
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---
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# --description--
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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.
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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.
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# --instructions--
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Alter the animation rate for the element with the class name of `star-1` by changing its `@keyframes` rule to 50%.
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# --hints--
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The `@keyframes` rule for the `star-1` class should be 50%.
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```js
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assert(code.match(/twinkle-1\s*?{\s*?50%/g));
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```
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# --seed--
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## --seed-contents--
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```html
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<style>
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.stars {
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background-color: white;
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height: 30px;
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width: 30px;
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border-radius: 50%;
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animation-iteration-count: infinite;
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}
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.star-1 {
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margin-top: 15%;
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margin-left: 60%;
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animation-name: twinkle-1;
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animation-duration: 1s;
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}
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.star-2 {
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margin-top: 25%;
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margin-left: 25%;
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animation-name: twinkle-2;
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animation-duration: 1s;
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}
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@keyframes twinkle-1 {
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20% {
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transform: scale(0.5);
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opacity: 0.5;
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}
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}
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@keyframes twinkle-2 {
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20% {
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transform: scale(0.5);
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opacity: 0.5;
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}
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}
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#back {
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position: fixed;
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padding: 0;
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margin: 0;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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background: linear-gradient(black, #000099, #66c2ff, #ffcccc, #ffeee6);
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}
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</style>
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<div id="back"></div>
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<div class="star-1 stars"></div>
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<div class="star-2 stars"></div>
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```
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# --solutions--
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```html
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<style>
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.stars {
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background-color: white;
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height: 30px;
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width: 30px;
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border-radius: 50%;
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animation-iteration-count: infinite;
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}
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.star-1 {
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margin-top: 15%;
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margin-left: 60%;
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animation-name: twinkle-1;
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animation-duration: 1s;
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}
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.star-2 {
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margin-top: 25%;
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margin-left: 25%;
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animation-name: twinkle-2;
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animation-duration: 1s;
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}
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@keyframes twinkle-1 {
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50% {
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transform: scale(0.5);
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opacity: 0.5;
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}
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}
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@keyframes twinkle-2 {
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20% {
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transform: scale(0.5);
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opacity: 0.5;
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}
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}
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#back {
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position: fixed;
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padding: 0;
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margin: 0;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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background: linear-gradient(black, #000099, #66c2ff, #ffcccc, #ffeee6);
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}
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</style>
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<div id="back"></div>
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<div class="star-1 stars"></div>
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<div class="star-2 stars"></div>
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```
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