I need my Shopify homepage image to have a fixed aspect ratio on all screen sizes

General information for the business: We sell meal kits online
Kind of development: Customization of existing program
Description of every module: I need someone to have Shopify fix the aspect ratio of my homepage main image. Currently it is squashing the image when viewed on larger and some smaller screen sizes/devices.

I need it to look right on them all so the objects in the image don't look misshapen.
Description of requirements/functionality: I need the homepage main image to have a constant aspect ratio so the objects in the image don't look misshapen.
Specific technologies required: Shopify development
Extra notes: You can view the homepage image here: www.kesselsingredients.com