Trying get the header section larger

Hello all! TOTAL newby here and I’ve run into a problem I can’t seem to resolve on my own. I’m using Storefront with Boutique and the Navigation Bar covers up part of my Header picture. I found .css to remove the search box from the header and it works as it should. I’ve been able to increase the header size to show all the picture but the search box returns. I can’t seem to figure out how to make both happen.

My site is wyandotte-customs.net

If you would please, post answers and suggestions in “dummy” terms becasue like I said I have no background web building.

Had this is in the wrong section…