How to make Storefront secondary navigation smaller

My Storefront header is too high – I do not want so much space between the site heard and site tag. I guess there is a secondary navigation bar above the primary menu which does no display because I am not using it.

What is the css name to change so the size (height) of the secondary navigation bar? I may also need to change the height of the search bar. What is the css nme for the search bar to add css?

I like the height of the ‘the morning ater’ theme, but I can’t jst copy it into Storefront theme.

I am stuck.