Hi @gdandrija, Thank you so much for getting back to me! I added this in but found that there is a line in the co-blocks code specifically setting the width to 50% at 400 so I added the following in addition to what you sent and that seems to have fixed it.
@media(min-width: 400px) {
li.coblocks-gallery–item {
width: 100% !important;
}
}
Thanks again!