In the style section of an HTML document, type the name of the class, a space, and an opening curly bracket to begin the definition.
在HTML文档的样式部分中，输入类名、一个空格和一个前花括号，开始定义。
In the style section of an HTML document, type the name of the class, a space, and an opening curly bracket to begin the definition.
在HTML文档的样式部分中，输入类名、一个空格和一个前花括号，开始定义。
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