I want to scroll down and the menu and header remain in top, don´t dissapear. I try to put the opcion "position:fixed" in some parts, the header remain in top but the menu not, and missalign. I don´t know where I add these "position:fixed" or something else.
Sorry, but we don’t provide support for basic CSS here. You would need to upgrade to [iurl=https://geek.hellyer.kiwi/services/premium-support/]Premium Support[/iurl] for that, or perhaps try a CSS forum such as the one at SitePoint.com[/url:2yhm97pe].