Use display: unset instead of display: block for dealing with the --0 utility selectors. #35

There is a set of utility classnames that you can add to an element that just tells the element how many columns to span at a given breakpoint so you don't have to declare explicit grid positioning for the element (e.g. ibm-grid__col--lg--2).

This includes the ability to hide a column with --0 which uses display: block. To override this at higher breakpoints, the selectors use display: block but display: unset should achieve the same thing without offering an opinion about just which type of display the element should be add.