@media (min-width: 576px) and (max-width: 991px) {
    .wp-block-heading.sfb-size-tablet,
    .sfb-editor-tablet.wp-block-heading,
    .sfb-editor-tablet .wp-block-heading {
        font-size: var(--sfb-tablet-size) !important;
    }
}
@media (max-width: 575px) {
    .wp-block-heading.sfb-size-mobile,
    .sfb-editor-mobile.wp-block-heading,
    .sfb-editor-mobile .wp-block-heading {
        font-size: var(--sfb-mobile-size) !important;
    }
}