Full width / container not working for single pages

Hi, I’ve searched everyone almost for the past 3 days and can not find a solution.

Recently just switched to Zerif Lite from Vantage Pro and I am trying to make my single pages be full width.

For example on this page: thethronesc.com/size-swap
I am trying make the page be full width, to the point where my meta slider extends to the end of the page on the left and right side. I feel like the problem is related to the container of the page, which does not extend all the way out. Is it possible to change the container for just these single pages?

I would also like the form to extend to 100% width of the page and not container. So i can add a parralax background behind the form.
Basically, I would like to make the form look exactly like the contact form on the home page. Where there is a background with 100% width.

If you could please help, I would greatly appreciate it!