Ionic Cards element height same as width (responsive)

Hi folks! There’s one thing, that’s been bothering me for quite some time.
How (if possible), can I achieve cards layout to be squared all the time on all devices.
Card with “Maskota” is squared in iPhone 5S, however, that’s not the case on iPhone 6 - which is wider.

I’m not aware of flexbox solution for that issue. Any tips?
Thanks, take care!