.edit-post-visual-editor .wp-block-zak-block-b2b-two-columns-image .wp-block-columns .wp-block-column {
    padding: 0 20px;
}
@media (min-width: 782px) {
    .edit-post-visual-editor .wp-block-zak-block-b2b-two-columns-image .block-editor-block-list__block.wp-block-column:not(:first-child) {
        margin-left: 0;
    }
}

@media (min-width: 600px) {
    .edit-post-visual-editor .wp-block-zak-block-b2b-two-columns-image .block-editor-block-list__block.wp-block-column:nth-child(2n) {
        margin-left: 0;
    }
}