Okay so I'm not amazing with css but I think I may have solved this,
Firstly install Firebug forFirefox and then go to your page, right click on the block that you want to resize or change color of. You then need to find the Body ID, it will be somewhere near the top and will have the word 'Collection' followed by a series of numbers. i.e.....
body='collection-54a9de84e3b040ef87e421ef'
You then need to find the .sqs widget code for your block, I am trying to change the background color of an audioblock so my .sqs widget code is.....
sqs-widgets-audio-player-content
... but th