For mobile, please amend the code to this:
@media only screen and (max-width: 767px) {
.spb_content_element.spb_image_banner.col-sm-4,
.spb_content_element.spb_image_banner.col-sm-6 {
padding-bottom: 30px;
}
}
For desktop, please add a Blank Spacer asset between the Two/Three column Row from the Page Builder: