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

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

```html
<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.

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

Your `h2` element should have the class `red-text`.

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

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

```js
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.

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

# --seed--

## --seed-contents--

```html
<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--

```html
<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>
```