# header div固定，content div填充父容器

* HTML

  ```markup
  <div class="parent">
    <div class="header">
        header
    </div>
    <div class="content">
        content
    </div>
  </div>
  ```
* CSS

  ```css
  .header {
    height: 50px;
  }
  .content {
    margin-top: -50px;
    padding-top: 50px;
    height: 100%;
  }
  ```

  通过负的margin-top来实现，好可耻233333


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