Shrinking header and position of menu cart

Hi there, thanks for your message!

It looks like your theme sets a height for the menu items on page load, and then uses javascript to adjust them to a new height as you scroll down the page. I would recommend looking at what classes are included in your other menu items but not in the menu cart. Then use this method here: https://wpovernight.com/faqs/add-extra-classes-menu-cart-item/

If you need us to do it for you we have a custom css service available at WP Overnight: https://wpovernight.com/downloads/menu-cart-pro/