Already mentioned this, but we should find a solution to importing the CSS file referenced as an external link by the HTML documentation generated by Roma. It should be all present in one file and not need access to the internet to display nicely.
I understand the desire not to hard code it in the CSS.
I'll try to think of an XSLT solution to read in Non-XML data. In XSLT2 there is an unparsed-text() function to do exactly this. I don't know whether EXSLT or similar might have an extension to do this in XSLT1.
I'll try to find out, I file this bug as a reminder to myself mostly.