Fix close button placement (#374)
* fix close button position in grid so that it always has room and affects layout
rely on negative width columns having a width of zero
it does look a little funny in large scale because the padding on the close button side is bigger :-/
* min max because at small screens the padding was collapsing
* minmax IS the solution!!!
Co-authored-by: Danni <drobinson@livefyre.com>
