273 lines
5.4 KiB
Markdown
273 lines
5.4 KiB
Markdown
---
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id: 5a9d7286424fe3d0e10cad13
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title: Attach a Fallback value to a CSS Variable
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/c6bDNfp'
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forumTopicId: 301084
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dashedName: attach-a-fallback-value-to-a-css-variable
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---
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# --description--
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When using your variable as a CSS property value, you can attach a fallback value that your browser will revert to if the given variable is invalid.
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**Note:** This fallback is not used to increase browser compatibility, and it will not work on IE browsers. Rather, it is used so that the browser has a color to display if it cannot find your variable.
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Here's how you do it:
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```css
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background: var(--penguin-skin, black);
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```
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This will set background to `black` if your variable wasn't set. Note that this can be useful for debugging.
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# --instructions--
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It looks like there is a problem with the variables supplied to the `.penguin-top` and `.penguin-bottom` classes. Rather than fix the typo, add a fallback value of `black` to the `background` property of the `.penguin-top` and `.penguin-bottom` classes.
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# --hints--
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The fallback value of `black` should be used in the `background` property of the `penguin-top` class.
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```js
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assert(
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code.match(
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/.penguin-top\s*?{[\s\S]*background\s*?:\s*?var\(\s*?--pengiun-skin\s*?,\s*?black\s*?\)\s*?;[\s\S]*}[\s\S]*.penguin-bottom\s{/gi
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)
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);
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```
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The fallback value of `black` should be used in `background` property of the `penguin-bottom` class.
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```js
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assert(
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code.match(
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/.penguin-bottom\s*?{[\s\S]*background\s*?:\s*?var\(\s*?--pengiun-skin\s*?,\s*?black\s*?\)\s*?;[\s\S]*}/gi
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)
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);
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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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.penguin {
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--penguin-skin: black;
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--penguin-belly: gray;
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--penguin-beak: yellow;
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position: relative;
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margin: auto;
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display: block;
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margin-top: 5%;
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width: 300px;
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height: 300px;
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}
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.penguin-top {
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top: 10%;
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left: 25%;
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/* Change code below this line */
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background: var(--pengiun-skin);
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/* Change code above this line */
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width: 50%;
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height: 45%;
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border-radius: 70% 70% 60% 60%;
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}
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.penguin-bottom {
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top: 40%;
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left: 23.5%;
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/* Change code below this line */
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background: var(--pengiun-skin);
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/* Change code above this line */
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width: 53%;
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height: 45%;
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border-radius: 70% 70% 100% 100%;
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}
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.right-hand {
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top: 0%;
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left: -5%;
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background: var(--penguin-skin, black);
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width: 30%;
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height: 60%;
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border-radius: 30% 30% 120% 30%;
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transform: rotate(45deg);
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z-index: -1;
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}
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.left-hand {
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top: 0%;
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left: 75%;
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background: var(--penguin-skin, black);
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width: 30%;
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height: 60%;
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border-radius: 30% 30% 30% 120%;
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transform: rotate(-45deg);
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z-index: -1;
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}
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.right-cheek {
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top: 15%;
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left: 35%;
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background: var(--penguin-belly, white);
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width: 60%;
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height: 70%;
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border-radius: 70% 70% 60% 60%;
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}
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.left-cheek {
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top: 15%;
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left: 5%;
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background: var(--penguin-belly, white);
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width: 60%;
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height: 70%;
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border-radius: 70% 70% 60% 60%;
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}
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.belly {
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top: 60%;
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left: 2.5%;
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background: var(--penguin-belly, white);
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width: 95%;
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height: 100%;
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border-radius: 120% 120% 100% 100%;
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}
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.right-feet {
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top: 85%;
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left: 60%;
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background: var(--penguin-beak, orange);
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width: 15%;
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height: 30%;
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border-radius: 50% 50% 50% 50%;
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transform: rotate(-80deg);
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z-index: -2222;
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}
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.left-feet {
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top: 85%;
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left: 25%;
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background: var(--penguin-beak, orange);
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width: 15%;
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height: 30%;
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border-radius: 50% 50% 50% 50%;
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transform: rotate(80deg);
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z-index: -2222;
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}
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.right-eye {
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top: 45%;
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left: 60%;
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background: black;
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width: 15%;
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height: 17%;
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border-radius: 50%;
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}
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.left-eye {
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top: 45%;
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left: 25%;
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background: black;
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width: 15%;
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height: 17%;
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border-radius: 50%;
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}
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.sparkle {
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top: 25%;
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left: 15%;
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background: white;
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width: 35%;
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height: 35%;
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border-radius: 50%;
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}
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.blush-right {
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top: 65%;
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left: 15%;
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background: pink;
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width: 15%;
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height: 10%;
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border-radius: 50%;
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}
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.blush-left {
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top: 65%;
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left: 70%;
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background: pink;
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width: 15%;
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height: 10%;
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border-radius: 50%;
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}
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.beak-top {
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top: 60%;
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left: 40%;
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background: var(--penguin-beak, orange);
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width: 20%;
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height: 10%;
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border-radius: 50%;
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}
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.beak-bottom {
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top: 65%;
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left: 42%;
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background: var(--penguin-beak, orange);
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width: 16%;
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height: 10%;
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border-radius: 50%;
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}
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body {
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background: #c6faf1;
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}
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.penguin * {
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position: absolute;
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}
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</style>
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<div class="penguin">
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<div class="penguin-bottom">
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<div class="right-hand"></div>
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<div class="left-hand"></div>
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<div class="right-feet"></div>
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<div class="left-feet"></div>
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</div>
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<div class="penguin-top">
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<div class="right-cheek"></div>
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<div class="left-cheek"></div>
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<div class="belly"></div>
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<div class="right-eye">
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<div class="sparkle"></div>
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</div>
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<div class="left-eye">
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<div class="sparkle"></div>
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</div>
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<div class="blush-right"></div>
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<div class="blush-left"></div>
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<div class="beak-top"></div>
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<div class="beak-bottom"></div>
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</div>
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</div>
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```
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# --solutions--
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```html
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<style>
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.penguin-top {
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background: var(--pengiun-skin, black);
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}
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.penguin-bottom {
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background: var(--pengiun-skin, black);
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}
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</style>
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```
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