Help needed with themes

I want to update my site and have just installer RW 8.0.3. I use High Sierra 10.13.6 and will soon update the OS.
I have picked Future theme and I want it to be all grey based on how it comes up.The problem shows when I want to have a look how it appears on other phones and computers. Please see the attached file. I also would like to sporten the height of the image. Any suggestions how to fix this?
Thanks in advance.

Part of what makes that theme work is the height of the top graphic…

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