paper_latern CSS/HTML Question

I customize currently my paper_latern and I have a few questions, First, what I can see from the CSS the theme has no wrapper that wraps all components of the design like navbar, sidebar, content.. these 3 elements are not wrapped into one div so I was forced to edit every element to center the entire theme with space left and right, What I did was on navbar content & wrap add CSS max-width: 1200px margin: 0 Auto sidebar: left: auto and cpanel_body: 3000px What is your approach to center paper_latern is there any better method? And my second question is about adding HTML elements, I can't find any info in the docs or video how I can add my own HTML to paper_latern, for example, I want above the navbar_cpanel my own header section, is this possible and how I can do this? Thanks