When I open the website on my iPhone as a app (“Add to Home Screen”) I’ve getting a problem. When I scroll up the website moving but I wanted that the header area is fixed and don’t moving, if I scroll up.

The scrolling should be still work.
Scrolling like this shouldn’t work

header {
    position: fixed;
}

I want everything to be scrollable, but not across the website. However, this can be done in the footer.