Remove white space help in storefront

Hello

I wonder if one of you lovely lot could help a nearly bald newbie 🙂
Currently I am running woocommerce and storefront and I’ve got my site looking ok (for a complete beginner) but… all the white space between the bottom of the header and the category images really irritates me. I feel cheeky asking as I know this is something silly and many people have much bigger things they need help with but… if you can chuck some code at me to put in the customise ccs I would be so chuffed. Please don’t ask me to go in to the php and edit function css or find file in core of whatever haha because I can’t get a grasp on that yet. I am trying though 🙂

Thanks in advance for any help, suggestions or points towards tutorials.
A nice cuppa and biscuit would be nice too but now I know I’m pushing my luck lol.

My website is http://www.tpgifts.co.uk