143 lines
3.6 KiB
Markdown
143 lines
3.6 KiB
Markdown
---
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id: bad87fee1348bd9aecf08806
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title: Use a CSS Class to Style an Element
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/c2MvDtV'
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forumTopicId: 18337
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dashedName: use-a-css-class-to-style-an-element
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---
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# --description--
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Classes are reusable styles that can be added to HTML elements.
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Here's an example CSS class declaration:
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```html
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<style>
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.blue-text {
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color: blue;
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}
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</style>
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```
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You can see that we've created a CSS class called `blue-text` within the `<style>` tag. You can apply a class to an HTML element like this: `<h2 class="blue-text">CatPhotoApp</h2>`. Note that in your CSS `style` element, class names start with a period. In your HTML elements' class attribute, the class name does not include the period.
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# --instructions--
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Inside your `style` element, change the `h2` selector to `.red-text` and update the color's value from `blue` to `red`.
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Give your `h2` element the `class` attribute with a value of `red-text`.
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# --hints--
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Your `h2` element should be red.
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```js
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assert($('h2').css('color') === 'rgb(255, 0, 0)');
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```
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Your `h2` element should have the class `red-text`.
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```js
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assert($('h2').hasClass('red-text'));
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```
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Your stylesheet should declare a `red-text` class and have its color set to `red`.
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```js
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assert(code.match(/\.red-text\s*\{\s*color\s*:\s*red;\s*\}/g));
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```
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You should not use inline style declarations like `style="color: red"` in your `h2` element.
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```js
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assert($('h2').attr('style') === undefined);
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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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h2 {
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color: blue;
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}
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</style>
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<h2>CatPhotoApp</h2>
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<main>
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<p>Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<div>
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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</div>
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<form action="https://freecatphotoapp.com/submit-cat-photo">
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<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<label><input type="checkbox" name="personality" checked> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Energetic</label><br>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</main>
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```
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# --solutions--
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```html
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<style>
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.red-text {
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color: red;
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}
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</style>
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<h2 class="red-text">CatPhotoApp</h2>
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<main>
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<p>Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<div>
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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</div>
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<form action="https://freecatphotoapp.com/submit-cat-photo">
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<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<label><input type="checkbox" name="personality" checked> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Energetic</label><br>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</main>
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```
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