What is the optimal method of site layout with tensile elements (header, footer and any others), in which these elements closely adjoin the browser window?
I will give a specific example. On the site template below the cap and footer with a fill; There should be no space between their extensible edges and the browser.
And here is my site header: as you can see, I have fields between the edges of the header and the browser window, although the margin header is 0 on all sides.
I messed it up like this:
header{ position: realtive; min-width: 1000px; height: 70px; background-color: #3CBAC8; margin: 0; } I looked at other sites in my browser - there are no fields.
I heard about such a layout method as pseudo-spacers, which is used for sites that are stretchable across the width of the window, but I ask for a solution with a minimum of tags and classes.

