changing the green title color

[icono]

Hi everyone,
I would like to change every font that appears in grey (mainly the titles and the tag cloud...). Where can I do that?

thanks,

www.iconoclaste.biz/ivyslam

[icono]

I would also like to change the font size or format of my posts. When they're on the home page, they seem OK, but whenever I click on the post (http://iconoclaste.biz/ivyslam/?p=1), they appear bigger and different, I don't know why that changed...
anyone can help?

[icono]

I managed to change the grey color but not the font format or size. It's still weirdly large...
www.iconoclaste.biz/ivyslam

if anyone knows how to fix that, let me know!