Here's the website and particular page that I want to change:

www.wellnesscoalition-avaloneast.ca/index.php?option=com_k2&view=itemlist&layout=category&task=category&id=30&Itemid=23

I'd like to decrease the font size of these titles as well as decrease the spacing between each title. I tried making some changes in the .css file but to no avail.

Thanks for your assistance,

Lillian

edit /templates/rt_panacea_j15/css/template.css file

add below css
div.catItemHeader h3.catItemTitle {
font-size: 12px;
}
at the end of templates.css

Save > Refresh your browser

if you want change your style you can using firefox with add-on firebug to bug css before apply