How can I make shotter the top bg images?

Hello.
How can I make shotter the top bg images?
I mean the images, that on the top on the each pages. That images take all screen, but I want them to be half screen in height.
Please, let me know, how can I do that.
I mean not main page, I mean other pages of my site
My site is here viktoria-logistik.ru

Thank you
Katherine

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