How to fix banner sizing issues on Dawn 13.0 for mobile view?

[HREMotorsport]

Hi,

I'm busy building my theme on Dawn 13.0

I added banner images on my home page. 

On the desktop view it's perfect but on the mobile view the banner image is cut off and doesn't automatically resize. 

I tried everything in CANVA to change sizes as I made these banners in CANVA. 

Anyone else have the same issue and got it resolved ? 

[HREMotorsport]

Thank you - I changed my theme to spotlight and it automatically fixed the problem. 

[MichalKopec]

Image rezising is generally directed by css rules of your theme. You don't need to have different versions of the banner for different devices. Maybe the banner itself hasn't been set up for mobile responsivity.