Post Colour | Comments

hi there!
i need to do 2 things and I can’t find anything in the theme that can help me:\
1. first of all i want to change the post colour and I can’t find any option in the customisation. it’s white by default… https://www.webdesignifat.byethost8.com/2015/10/18/3/
I want it to be in the site overall colour (I’ve got the hex colour code).
2. i need to remove the comment section entirely. how do i do it?

thx everyone!!!!:)