Where is Azure Blue layout stored in Framemaker?

Hi,

It is my understanding that when you generate HTML5 from Framemaker, it retrieves the selected layout from its predefined HTML5 layouts collection, which is stored in the installation directory. 

I am using the Azure Blue layout and would like to make some changes to it before the Help is generated.  I can find the layout files in the Output folder that are saved each time I generate the Help. I can edit them and save them and then manually copy them into the output to change fonts/colors, etc., but was hoping to find the layout files that Framemaker retrieves during the generation process, so I can modiffy them and skip that manual copy process each time I generate the Help. 

Does anyone know where the layout files are stored?  I've searched all the Adobe and Framemaker fodlers on my system with no luck. I thought they were in

C:\Program Files\Adobe\Adobe FrameMaker <version>\Structure\XMLApplication\DITA\outputTemplates\responsiveHTML5\AzureBlue, but I don't have the responsiveHTML5 folder in that pathname on my system. 

Thank you.