I’m trying to make some block columns stack to prevent words in the columns from breaking up: Basically, I want to widen the point at which the columns revert to stacking:

@media only screen and (max-width: 1899px) {
  .wp-block-column {
        flex-basis: 100% !important;
    }
}

Obviously, 1899px is a bit extreme, but I’m trying to get a reaction and afterwards make it more precise. This snippet has not made a difference, though; I’ve tried changing this in the Customizer’s Additional CSS, as well as in the wp-includes/blocks/columns/style.css file, but to no avail.

Any ideas for a solution?