How to change viewing of "3 columns bloc" on tablets?

I have “3 columns bloc” on the page. It displays just perfect on PC’s. But it doesn’t on tablets. Very thin columns I think and images are too small.

How to change viewing of 3 columns bloc on tablets? I mean that now I have this result:

But I think it would be much better to display 3 columns bloc like this:

How can I do it using custom classes?