Portfolio Lite CSS

I’ve had only a little experience with style sheets and I’m having trouble figuring out how to change anything with the Portfolio Lite theme.

I have just a simple portfolio site with just a few pages. I need to modify the appearance here and there with changes to font point sizes & colors, alignment and column width. As an example, the text at the top of the Work page is too big and too pale…

http://moonwortstudio.com/?page_id=6

I also want the site tagline to right-align with images.

I’ve tried making a few changes in the Portfolio Lite main style sheet (style.css), but it doesn’t seem to affect anything.

Any tips?

The page I need help with: [log in to see the link]