Hi Yigit, thanks for getting back. You can view my development here:
http://christianmacleod.com/dev/

and login:
http://christianmacleod.com/dev/wp-admin/
user: steven
pass: bleep123

I was able to change the desktop size but it created a visible footer the same height as the menu. I wondered if there was a better, simpler way to work across all devices.

Thanks in advance
Steven