Help with Styling Widgets

Hi all,

I'm wondering if anyone can help, I have a website with three widgets set up at the top which contain
*A Widget Title
*The featured image of a most recent post in a category
*The excerpt of a most recent post in a category
*A link to all of the posts in that category

The blog is here: http://www.jonrouston.co.uk/blog/

I'm having problems getting those elements to line up correctly so that each of the four things detailed above lines up in the center.

So far I've tried
*Giving lots of elements a width of 33%
*Using text-align: center on stuff
*Removing the indent on the lists in Atahualpa style widgets

As you can see, I'm a bit of a CSS novice. If anyone could point me in the right direction (I'm not asking for code, just a bit of a nudge in the right direction), I'd be really grateful.

Thanks
Jon
jon