freeCodeCamp/curriculum/challenges/chinese/03-front-end-libraries/bootstrap/ditch-custom-css-for-bootstrap.md

---
id: bad87fee1347bd9aedf08845
title: 用 Bootstrap 来取代我们之前的自定义样式
challengeType: 0
forumTopicId: 17565
dashedName: ditch-custom-css-for-bootstrap
---

# --description--

现在我们可以清理一下之前代码，用 Bootstrap 的内置样式来替换我们之前定义的样式，这样会让我们的 Cat Photo App 看起来更简洁些。

别担心————以后我们会有大把时间来自定义我们的 CSS 样式的。

删除 `style` 元素里的 `.red-text`, `p`, 和 `.smaller-image` CSS 声明，使 `style` 元素留下的声明只有 `h2` 和 `thick-green-border`.

删除包含死链接的 `p` 元素。 然后将 `h2` 的 `red-text` class 替换为 Bootstrap 的 `text-primary` class.

最后, 将你第一个 `img` 元素的 "smaller-image" class 替换为 `img-responsive` class.

# --hints--

h2 元素的 class 不应为 `red-text`。

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

h2 元素的 class 应为 `text-primary`。

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

你的段落元素（p）应该不再使用 `Monospace` 字体。

```js
assert(
  !$('p')
    .css('font-family')
    .match(/monospace/i)
);
```

移除你第一张图片的 class 属性 `smaller-image`。

```js
assert(!$('img').hasClass('smaller-image'));
```

给你的第一张图片添加 class 属性 `img-responsive`。

```js
assert($('.img-responsive').length > 1);
```

# --seed--

## --seed-contents--

```html
<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
  .red-text {
    color: red;
  }

  h2 {
    font-family: Lobster, Monospace;
  }

  p {
    font-size: 16px;
    font-family: Monospace;
  }

  .thick-green-border {
    border-color: green;
    border-width: 10px;
    border-style: solid;
    border-radius: 50%;
  }

  .smaller-image {
    width: 100px;
  }
</style>

<div class="container-fluid">
  <h2 class="red-text text-center">CatPhotoApp</h2>

  <p>Click here for <a href="#">cat photos</a>.</p>

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

  <img src="https://bit.ly/fcc-running-cats" class="img-responsive" alt="Three kittens running towards the camera.">
  <div class="row">
    <div class="col-xs-4">
      <button class="btn btn-block btn-primary">Like</button>
    </div>
    <div class="col-xs-4">
      <button class="btn btn-block btn-info">Info</button>
    </div>
    <div class="col-xs-4">
      <button class="btn btn-block btn-danger">Delete</button>
    </div>
  </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>
  <form action="https://freecatphotoapp.com/submit-cat-photo">
    <label><input type="radio" name="indoor-outdoor"> Indoor</label>
    <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
    <label><input type="checkbox" name="personality"> Loving</label>
    <label><input type="checkbox" name="personality"> Lazy</label>
    <label><input type="checkbox" name="personality"> Crazy</label>
    <input type="text" placeholder="cat photo URL" required>
    <button type="submit">Submit</button>
  </form>
</div>
```

# --solutions--

```html
<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
  h2 {
    font-family: Lobster, Monospace;
  }

  .thick-green-border {
    border-color: green;
    border-width: 10px;
    border-style: solid;
    border-radius: 50%;
  }
</style>

<div class="container-fluid">
  <h2 class="text-primary text-center">CatPhotoApp</h2>

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

  <img src="https://bit.ly/fcc-running-cats" class="img-responsive" alt="Three kittens running towards the camera.">
  <div class="row">
    <div class="col-xs-4">
      <button class="btn btn-block btn-primary">Like</button>
    </div>
    <div class="col-xs-4">
      <button class="btn btn-block btn-info">Info</button>
    </div>
    <div class="col-xs-4">
      <button class="btn btn-block btn-danger">Delete</button>
    </div>
  </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>
  <form action="https://freecatphotoapp.com/submit-cat-photo">
    <label><input type="radio" name="indoor-outdoor"> Indoor</label>
    <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
    <label><input type="checkbox" name="personality"> Loving</label>
    <label><input type="checkbox" name="personality"> Lazy</label>
    <label><input type="checkbox" name="personality"> Crazy</label>
    <input type="text" placeholder="cat photo URL" required>
    <button type="submit">Submit</button>
  </form>
</div>
```