Change the size of an image on mobile

Hey guys,

Really need help with resizing the images that I have on my website on mobile ONLY.

Can I incorporate some kind of code to images to make them 50% or 25% of the size on mobile only?

I'm talking about the 4 logos I have on my website - on mobile they just take up the whole screen.

What could I do to make them smaller on mobile?

My website is michaelsterling.co and my template is Bedford.

Would appreciate any help.

Thank you!