.modal-body * {
    font-size: var(--iw-h6-font-size);
}

.modal-body h1,
.modal-body .h1,
.modal-body h2,
.modal-body .h2,
.modal-body h3,
.modal-body .h3,
.modal-body h4,
.modal-body .h4,
.modal-body h5,
.modal-body .h5,
.modal-body h6,
.modal-body .h6,
.modal-body .element-header {
    font-weight: 700;
}