Actually, you can use absolute positioning to achieve what you want, in a fixed-width layout. You use CSS to add padding to the top of the content which is equa

Actually, you can use absolute positioning to achieve what you want, in a fixed-width layout. You use CSS to add padding to the top of the content which is equal to the height of your navbar/header and give the navbar/header position absolute and top 0. I haven't figured out how to do this with responsive layouts. It's never worked well for me but I will come up with a solution one day.