[xwiki-users] Skins - Fix Nav Menus when scrooling page content

Hi XWiki Team, I'm trying to design a new skin based on flaming to attend our company's use cases (with XE 8.x) and we were required to fix the top menu divs (for instance, the menuview div and the headerglobal div), as well as, if possible, side panels, while scrooling the page content. The side panels div shoud also be scroolabe, when the elements overflow the viewport. I could not achieve any success overriding some flamingo's CSS and trying to fix elements with position CSS statement. How is the best way to achieve that using a new skin approach? I won't also forget to be responsible for small screens, so fixing side panels and top menu is not a good idea. How is the best way to deal with this? Best Regards, RAMON BRANDÃO