I'm trying to learn how to read it and I'm hoping the site you use has descriptions specific to their format. I'm not quite sure what the significance of the empty/solid green/red boxes across the top mean. I suspect its empty/filled buy/sell orders, but that's just a guess.
And is there a significance to the left-right order of the boxes? I also suspect that the L2 is much more animated in real-time. Seeing it in action would probably explain a lot.