XF 1.3 Space between Navbar and browser


Active member
Hi, I'm hoping someone will be able to help on here.

Basically, there is a blank transparent space between the Navbar and the top of the browser that I cannot remove. I have hidden the logo block but can not remove this gap. It only appears when users are not logged in. After login it will return to the top of the browser.

Does anyone know what I need to do?