--- id: 587d78ac367417b2b2512af4 title: Use the flex-direction Property to Make a Column challengeType: 0 videoUrl: '' localeTitle: 使用flex-direction属性创建列 --- ## Description
最后两个挑战使用了flex-direction属性设置为row。此属性还可以通过垂直堆叠Flex容器的子项来创建列。
## Instructions
将CSS属性flex-direction添加到#box-container元素,并为其赋值column。
## Tests
```yml tests: - text: '#box-container元素应该将flex-direction属性设置为column。' testString: 'assert($("#box-container").css("flex-direction") == "column", "The #box-container element should have a flex-direction property set to column.");' ```
## Challenge Seed
```html
```
## Solution
```js // solution required ```