Uniform width and image mat removal

Hi and thanks for the previous solution. I have two more questions unrelated to the previous theme so I start a new topic:

1. How can I remove the gray border around single images in a page? There is no border around gallery images, just around single ones.

2. Is there an easy way to have the logo, header menu end and content box all to align to the same borders, for example to fit within 1200px when on desktop?

Thank you once again for a great theme and great support!

The page I need help with: [log in to see the link]