Messed up blog : white bars gone

Hi

I changed the content of a html widget and all my white bars were gone (right and middle).
How can I restore them ? The CSS was done for me by a friend who’s not available. I have no CSS knowledge to speak of.

Thanks!

My blog is here : https://autoblogging.info
The white bars are supposed to look like this : https://www.leblogdelamirabelle.net