ul.library-collection-list {
    -moz-column-count: 1;
    -moz-column-gap: 20px;
    -webkit-column-count: 1;
    -webkit-column-gap: 20px;
    column-count: 1;
    column-gap: 20px;
}
@media (min-width: 600px) {
	ul.library-collection-list {
		-moz-column-count: 2;
		-moz-column-gap: 20px;
		-webkit-column-count: 2;
		-webkit-column-gap: 20px;
		column-count: 2;
		column-gap: 20px;
	}
}