Photoshop background not responsive

Hi everyone, I know you might say that this is a photoshop issue but I’m going to ask anyway.
I have created a background in photoshop that I want to use for my landing page. The background has a picture either side of the page and it looks great when viewing on laptop screen and even iPad (in landscape mode), but as soon as I shrink the screen for mobile or even turn the iPad in portrait I lose the pictures as they are being cut off on the side of the screen.
How do I make this responsive? Can I do this in X or do I need to do this in photoshop?
Many thanks

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