This is an example of using inline-block, fixed size cards, see the calendar here:-
http://burtonstatherheritage.org/history-calendar/
This one uses flexbox, so not a rigid fixed size, but still uniform to each line:-
http://burtonstatherheritage.org/roll-of-honour/
Both will shrink down to mobile size and stand up to font zoom.
Use Inspect to see how they work.