Want to reduce font size in H2

[len backus]

I have added a VBSEO Relative Replacement to "showthread" using an H2 tag for the thread title in the RR. I would like H2 to use a smaller font. Earlier, I had been successful in reducing font size for H2 used in my vBadvanced Dynamics article pages. This is done by inserting style code into the box near the bottom of the style editing page.

But...this style code modification doesn't affect the HTML code I placed in the showthread template. Any ideas?

Also, in general, I'd like this style modification to eliminate the extra vertical spacing between lines and usually present in H tags.