freeCodeCamp/curriculum/challenges/chinese/01-responsive-web-design/basic-css/change-the-font-size-of-an-element.md

---
id: bad87fee1348bd9aedf08806
title: 更改元素的字体大小
challengeType: 0
videoUrl: 'https://scrimba.com/c/c3bvDc8'
forumTopicId: 16777
dashedName: change-the-font-size-of-an-element
---

# --description--

字体大小由 `font-size` 属性控制，如下所示：

```css
h1 {
  font-size: 30px;
}
```

# --instructions--

在包含 `red-text` 的类选择器的 `<style>` 声明区域的里，创建一个 `p` 元素样式规则，并设置其 `font-size` 为 `16px`。

# --hints--

在 `style` 样式声明区域里，`p` 元素的 `font-size` 的值应为 `16px`。 请注意，浏览器和文本缩放应设置为 100％。

```js
assert(code.match(/p\s*{\s*font-size\s*:\s*16\s*px\s*;\s*}/i));
```

# --seed--

## --seed-contents--

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

<h2 class="red-text">CatPhotoApp</h2>
<main>
  <p class="red-text">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;
  }
  p {
    font-size: 16px;
  }
</style>

<h2 class="red-text">CatPhotoApp</h2>
<main>
  <p class="red-text">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>
```