ASP。NET StaticMenuItemStyle-CssClass属性没有显示正确的样式

I have a CssClass that I want to set to the StaticMenuItemStyle-CssClass attribute. In the design view the menu has all of the style attributes. But when I run it, none of the attributes are displaying. The background is white and text is blue. This is the CssClass:I have a CssClass that I want to set to the Sta