Underlining links only in Quickbook/doxygen C++ references sections?

Following observations that hyperlinks were not obvious enough, I have been experimenting with using
underlining to highlight links.
 
I've done this simply by changing boostbook.css.
 
This does indeed make the links much more clear (especially those whose vision is Chromatically
Challenged ;-)
 
(See attached snip).
 
but the downside is that underlning looks ugly for the main TOC.
 
Can anyone suggest if and how it is possible to use a different .css for just the C++ Reference
sections.
 
Thanks
 
Paul
 
---
Paul A. Bristow,
Prizet Farmhouse, Kendal LA8 8AB  UK
+44 1539 561830  07714330204
[email protected]

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