Background color Temp. 4

Hi,

How do I change the background color of the block behind the text.
This is the URL: https://bwoi-boeftattoos.nl/

I need it to be 100% transparent. I’ve checked out the code with the Firebug tool,
I think this should be it:

<div class=”inline_block mg_top” style=”background: none repeat scroll 0 0 #ebebeb”>

But i can’t find the file where I change it.

Hope you can help.

Kind regards,
Jeff