hfy-link-style-fun

hfy-link-style-fun is a variable defined in `htmlfontify.el'.
Its value is

hfy-link-style-string

Documentation:
Function to customize the appearance of hyperlinks.
Set this to a function, which will be called with one argument
(a "{ foo: bar; ...}" CSS style-string) - it should return a copy of
its argument, altered so as to make any changes you want made for text which
is a hyperlink, in addition to being in the class to which that style would
normally be applied.

You can customize this variable.