How can I adjust the padding around my logo?

Hi all. I’ve been trying to sort this out all day and I’m no closer.

This is my very first time making a store so I’m not very clued up at all.

How do I reduce the padding at the top and bottom of my logo and the top of my website please?

I have a ‘theme.liquid’ but not a ‘theme.css.liquid’

I’m clueless and it’s driving me nuts. I have too much space above my logo.

Any help is much appreciated, thanks!

EDIT: Here’s a screen shot.

I’d like to reduce the space in the red boxes please

Please, provide the site url so that others can check.

The site isn’t live yet. It’s still password protected.

What should I do for others to be able to check?