I've got a table like
that of course displays like:
A B C D
Now I'd like, in certain circumstances (responsive) make this display like
Thus, I'd like a "line break" between <td> B and C.
I'd like to handle this by setting a css class on cell C (or B) but not set any particular classes on the other cells.
Is there any smart css to use that forces a "line break" between two <td> cells?