Using Cascading Style Sheets
Cascading style sheets provide an easy way to present a consistent style for all pages in your web application. When you create a new MM .NET Web Forms application, a cascading style sheet named mm.css is automatically added to your new project.
If you double-click mm.css in the Solution Explorer, the file is opened in the IDE:

If you edit any of the styles and save changes, they are automatically applied to forms that reference the style sheet.
Applying a Style Sheet to a Web Form
To apply a cascading style sheet to a web form, double-click the form in the Solution Explorer to open it in design mode, and then drag and drop the style sheet from Solution Explorer onto the web form.If you click the HTML tab at the bottom left of the Visual Studio IDE:

You'll see the new reference to the style sheet in the <HEAD> element:

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