if the last child in a card (div.card > div.card-body) adds bottom
marging, we don't want the card to add more space through its
padding-bottom. most cards have children that add sufficient space
at the bottom anyways.
we don't need a margin at the bottom of tables in general. not sure why
this is even a thing in bootstrap. this change, in particular, makes the
space between a table and a parent card symmetric on all sides.
this change tries to achieve a pleasing look of input forms by
right-aligning the texts of labels. the input form now looks similar
to a table, achieving a cleaner look, especially for forms where the
labels have varying text lenghts.
