freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-css-class-to-style-an-element.md

id, title, challengeType, videoUrl, forumTopicId, dashedName

id	title	challengeType	videoUrl	forumTopicId	dashedName
bad87fee1348bd9aecf08806	Use a CSS Class to Style an Element	0	https://scrimba.com/c/c2MvDtV	18337	use-a-css-class-to-style-an-element

--description--

Classes are reusable styles that can be added to HTML elements.

Here's an example CSS class declaration:

<style>
  .blue-text {
    color: blue;
  }
</style>

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.

--instructions--

Inside your style element, change the h2 selector to .red-text and update the color's value from blue to red.

Give your h2 element the class attribute with a value of 'red-text'.

--hints--

Your h2 element should be red.

assert($('h2').css('color') === 'rgb(255, 0, 0)');

Your h2 element should have the class red-text.

assert($('h2').hasClass('red-text'));

Your stylesheet should declare a red-text class and have its color set to red.

assert(code.match(/\.red-text\s*\{\s*color\s*:\s*red;\s*\}/g));

You should not use inline style declarations like style="color: red" in your h2 element.

assert($('h2').attr('style') === undefined);

--seed--

--seed-contents--

<style>
  h2 {
    color: blue;
  }
</style>

<h2>CatPhotoApp</h2>
<main>
  <p>Click here to view more <a href="#">cat photos</a>.</p>

  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>

  <div>
    <p>Things cats love:</p>
    <ul>
      <li>cat nip</li>
      <li>laser pointers</li>
      <li>lasagna</li>
    </ul>
    <p>Top 3 things cats hate:</p>
    <ol>
      <li>flea treatment</li>
      <li>thunder</li>
      <li>other cats</li>
    </ol>
  </div>

  <form action="https://freecatphotoapp.com/submit-cat-photo">
    <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
    <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
    <label><input type="checkbox" name="personality" checked> Loving</label>
    <label><input type="checkbox" name="personality"> Lazy</label>
    <label><input type="checkbox" name="personality"> Energetic</label><br>
    <input type="text" placeholder="cat photo URL" required>
    <button type="submit">Submit</button>
  </form>
</main>

--solutions--

<style>
  .red-text {
    color: red;
  }
</style>

<h2 class="red-text">CatPhotoApp</h2>
<main>
  <p>Click here to view more <a href="#">cat photos</a>.</p>
  
  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
  
  <div>
    <p>Things cats love:</p>
    <ul>
      <li>cat nip</li>
      <li>laser pointers</li>
      <li>lasagna</li>
    </ul>
    <p>Top 3 things cats hate:</p>
    <ol>
      <li>flea treatment</li>
      <li>thunder</li>
      <li>other cats</li>
    </ol>
  </div>
  
  <form action="https://freecatphotoapp.com/submit-cat-photo">
    <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
    <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
    <label><input type="checkbox" name="personality" checked> Loving</label>
    <label><input type="checkbox" name="personality"> Lazy</label>
    <label><input type="checkbox" name="personality"> Energetic</label><br>
    <input type="text" placeholder="cat photo URL" required>
    <button type="submit">Submit</button>
  </form>
</main>