147 lines
4.1 KiB
Markdown
147 lines
4.1 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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---
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## Description
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<section id='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 <code>blue-text</code> within the <code><style></code> tag.
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You can apply a class to an HTML element like this:
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<code><h2 class="blue-text">CatPhotoApp</h2></code>
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Note that in your CSS <code>style</code> 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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</section>
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## Instructions
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<section id='instructions'>
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Inside your <code>style</code> element, change the <code>h2</code> selector to <code>.red-text</code> and update the color's value from <code>blue</code> to <code>red</code>.
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Give your <code>h2</code> element the <code>class</code> attribute with a value of <code>'red-text'</code>.
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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>h2</code> element should be red.
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testString: assert($("h2").css("color") === "rgb(255, 0, 0)");
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- text: Your <code>h2</code> element should have the class <code>red-text</code>.
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testString: assert($("h2").hasClass("red-text"));
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- text: Your stylesheet should declare a <code>red-text</code> class and have its color set to red.
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testString: assert(code.match(/\.red-text\s*\{\s*color\s*:\s*red;\s*\}/g));
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- text: You should not use inline style declarations like <code>style="color: red"</code> in your <code>h2</code> element.
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testString: assert($("h2").attr("style") === undefined);
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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>
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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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</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>
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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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</section>
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