Image in the menu of mobile

Hello.
I have some special questions.

  1. My client wants image instead of color in the menu of mobile device. Is it possible to set it up?
  2. When I change color of menu in the colors of header, color will not change in other devices(tablet, mobile). How can I fix it? Will it be similar with image?
    And my last question:
  3. Is it possible to set another aspect ratio of images in the slider(header slider, crelly slider) for another device(mobile, tablet)?

I send screen with changes

Hello,

Please create a separate topic for each of your issues to keep forum in good order and make it easier to help you. Hope for your understanding.

Kind Regards, Roman.