VERY EASY Problem to solve - help needed please

Im using Harmonic theme to create the site at http://www.berniicarr.com

I simply cannot find the right css to make the page titles and post titles appear a colour that is visible on a dark background. Probably a dirty white shade or really light grey.

I know it is an easy solution but after searching for over an hour and trying different CSS inside of the dashboard editor, I cannot get it to change. Help please