124 lines
2.9 KiB
Markdown
124 lines
2.9 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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---
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## Description
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<section id='description'>
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Sass has a feature called <code>extend</code> 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 <code>.panel</code> class. It has a <code>background-color</code>, <code>height</code> and <code>border</code>.
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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 <code>.big-panel</code>. It has the same base properties as <code>.panel</code>, but also needs a <code>width</code> and <code>font-size</code>.
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It's possible to copy and paste the initial CSS rules from <code>.panel</code>, but the code becomes repetitive as you add more types of panels.
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The <code>extend</code> 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 <code>.big-panel</code> will have the same properties as <code>.panel</code> in addition to the new styles.
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</section>
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## Instructions
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<section id='instructions'>
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Make a class <code>.info-important</code> that extends <code>.info</code> and also has a <code>background-color</code> set to magenta.
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: Your <code>info-important</code> class should have a <code>background-color</code> set to <code>magenta</code>.
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testString: assert(code.match(/\.info-important\s*?{[\s\S]*background-color\s*?:\s*?magenta\s*?;[\s\S]*}/gi));
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- text: Your <code>info-important</code> class should use <code>@extend</code> to inherit the styling from the <code>info</code> class.
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testString: assert(code.match(/\.info-important\s*?{[\s\S]*@extend\s*?.info\s*?;[\s\S]*/gi));
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<style type='text/sass'>
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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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</div>
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</section>
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## Solution
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<section id='solution'>
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```html
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<style type='text/sass'>
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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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</section>
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