117 lines
2.6 KiB
Markdown
117 lines
2.6 KiB
Markdown
---
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id: 587d7fa5367417b2b2512bbd
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title: Extend One Set of CSS Styles to Another Element
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challengeType: 0
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forumTopicId: 301456
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dashedName: extend-one-set-of-css-styles-to-another-element
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---
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# --description--
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Sass has a feature called `extend` that makes it easy to borrow the CSS rules from one element and build upon them in another.
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For example, the below block of CSS rules style a `.panel` class. It has a `background-color`, `height` and `border`.
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```scss
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.panel{
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background-color: red;
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height: 70px;
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border: 2px solid green;
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}
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```
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Now you want another panel called `.big-panel`. It has the same base properties as `.panel`, but also needs a `width` and `font-size`. It's possible to copy and paste the initial CSS rules from `.panel`, but the code becomes repetitive as you add more types of panels. The `extend` directive is a simple way to reuse the rules written for one element, then add more for another:
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```scss
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.big-panel{
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@extend .panel;
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width: 150px;
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font-size: 2em;
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}
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```
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The `.big-panel` will have the same properties as `.panel` in addition to the new styles.
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# --instructions--
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Make a class `.info-important` that extends `.info` and also has a `background-color` set to magenta.
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# --hints--
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Your `info-important` class should have a `background-color` set to `magenta`.
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```js
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assert(
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code.match(
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/\.info-important\s*?{[\s\S]*background-color\s*?:\s*?magenta\s*?;[\s\S]*}/gi
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)
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);
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```
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Your `info-important` class should use `@extend` to inherit the styling from the `info` class.
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```js
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assert(
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code.match(/\.info-important\s*?{[\s\S]*@extend\s*?.info\s*?;[\s\S]*/gi)
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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 type='text/scss'>
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h3{
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text-align: center;
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}
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.info{
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width: 200px;
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border: 1px solid black;
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margin: 0 auto;
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}
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</style>
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<h3>Posts</h3>
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<div class="info-important">
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<p>This is an important post. It should extend the class ".info" and have its own CSS styles.</p>
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</div>
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<div class="info">
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<p>This is a simple post. It has basic styling and can be extended for other uses.</p>
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</div>
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```
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# --solutions--
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```html
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<style type='text/scss'>
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h3{
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text-align: center;
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}
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.info{
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width: 200px;
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border: 1px solid black;
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margin: 0 auto;
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}
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.info-important{
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@extend .info;
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background-color: magenta;
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}
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</style>
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<h3>Posts</h3>
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<div class="info-important">
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<p>This is an important post. It should extend the class ".info" and have its own CSS styles.</p>
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</div>
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<div class="info">
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<p>This is a simple post. It has basic styling and can be extended for other uses.</p>
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</div>
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```
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