Thank you so much! This looks right as far as my still in it's infancy knowledge of CSS goes. I've only been doing this a very short time to accomplish specific goals and my understanding is limited.
I just grasped what selector is and How the "." overrides the other CSS (I think:) After seeing your example and doing a little research. Although I'm still unclear as to what the function of the "a" is.
I've started the site you see in the link. Surprisingly It's been quite busy from day one. Due to my stunning lack of knowledge many of the little changes I've made are directly in the files. I have disabled up dates for the time being. I also have a couple of development sites I've cloned over to other TDLS. to work with. In order to not kill the site by messing up the continuity my plan was to incorporate the many small changes into a child theme as I gain enough skill to do this properly.
In a nutshell my knowledge is still a little to incidental to know how to apply this directly (but if you want to make a shadow box or speed up your RSS feed I'm your guy :) You've already been a great help by leading me in the right direction, if you would be so kind as to nudge me forward through the first application of this I would be forever in your debt and will likely be able to apply it to future changes in other areas.
I may seem a bit cautious but the main site has seen 2k comments and over 85k hits in the first three weeks or so and I don't want to mess this up with wonky user annoying errors and sloppy graphics :)