删除树节点样式的定义如下面的清单32所示。

The remove tree node style is defined as shown below in Listing 32.

youdao

清单1显示screen . css文件的内容，我们使用这个文件定义主屏幕媒体相关样式。

Listing 1 shows the contents of the screen.css file we used to define our main screen media-specific styles.

youdao

css 文件（参见清单 10）定义了用于错误消息的 ValidationError 样式类

The valid.css file (see Listing 10) defines the ValidationError style class that is used for the error messages

youdao