currently Chrome is experiencing a regression wherein
@media (min-width: 992px) {
.card-columns {
column-count: 3;
column-gap: normal;
}
}
is not working, and it is necessary to add
orphans: 1;
widows: 1;
to the css in order to get a 3 column .card-columns to function correctly.
however BSS is marking that css as invalid (though it is including it in the generated stylesheet, so that's fine) with the red-line strikethru.