Header either cut or too low

[Olcyovnoc]

I’m facing a problem. I want my menu and logo in header to be at the very top of the screen like the first picture below. When i reached this point by editing the code it worked but i found that when opening any other page like cart and shop the logo and menu are cut and appear only half. How can i solve this issue where i maintain the height of the home page in the first image but be able to maintain it across all other pages as well. All the solutions I received required me to lower the home page’s menu and I don’t want to do that.This is my URL: www.convoyclo.com

thankyou