[web2py] Create a custom layout based on existing web site css

[Mark Kirkwood]

I am currently developing a web application using web2py. It is at the 
point where I want to customize the appearance to blend in with an existing 
html/templated site that I run - so I need to understand how to customize 
the web2py layout etc to make this happen. While there seems to be many 
templates/styles around that I could use, there does *not* seem to be a 
straightforward set of steps to describe how to use or adapt an existing 
set of css styles within web2py - or have I missed something?