Virtue kadence Image menu not scaling

Hi,

I am using Virtue free theme and am having trouble with the image menu on the home page not scaling/re sizing on smaller screens. The sides of the images cut off (before finally wrapping), which I don’t want to do as the image have text on them. I would really appreciate if someone could advice me on a way to fix this.

I have tried:

max-width: 100%;
 height: auto;

The site address is: https://www.thebiblenetwork.org.uk

Thanks,
Tahli