Help and Manual comes with many sample skins including responsive skins which cater for Mobile screens.
Templates are in C:\Program Files (x86)\EC Software\HelpAndManual7\Templates\HTML Skins and Premium Pack sub-directories.
I copied the template file "Flat_Blue_Diamond" from the Premium Pack to my own file and used it as a base for my own template.
The task then was to edit the header menu file and replace the H&M image files in the template's "baggage" directory with my custom files. The aim was to develop a responsive skin capable of being used whenever I produced a help file fo mobile use.