Content container colour change

Hi Ron

Lovely theme – particularly good for my new astrophotography site.

I would like to change the background color of the content container for each post that appears on the home page – its a grey colour that I want to be white – I can’t see where to change it in any of the options and i wouldnt know where to look in the CSS sheet??

is there an easy way to do this please. NB i have installed the child theme

cheers
KAren