How can I use the ready code of pure CSS menu maker in my dreamweaver??

I'm not sure if it is possible to just inject the ready codes from Dreamweaver since you need to manually get the ids and/or the classes of the elements in the form to style it using CSS codes.

How-to-Inject-Custom-CSS-Codes

How-to-Inject-CSS-Codes-to-Widgets

Customize-Your-Form-Using-Custom-CSS-Codes

You would be able to probably use the ready codes if you embed your form to your website using its Full Source code — How-to-get-the-Full-Source-Code-of-your-Form