4 Column Div Layout
I am trying to create a 4 column `<div>` layout.

Why are the row containers not drawing a border around the respective row?
Also, is this a good approach, as in is my css written well to be fluid and for dynamic resizing of the browser window?

Any suggestions or help would be most appreciated.

[Here][1] is my current attempt.


  [1]: http://jsfiddle.net/gmcalab/AN6pn/19/
4 Column Div Layout
===

I am trying to create a 4 column `<div>` layout.

Why are the row containers not drawing a border around the respective row?
Also, is this a good approach, as in is my css written well to be fluid and for dynamic resizing of the browser window?

Any suggestions or help would be most appreciated.

[Here][1] is my current attempt.


  [1]: http://jsfiddle.net/gmcalab/AN6pn/19/