I fixed this problem with the following code:
/* Quickview BUTTON style */
.sqs-product-quick-view-button-wrapper .sqs-product-quick-view-button {
font-family: 'Futura PT' !important;
opacity: 1;
font-size: 0.8rem;
padding: 15px;
letter-spacing: 1px;
text-transform: uppercase;
font-weight: 400; //change weight
}
/* Quickview lightbox TEXT styles*/
.sqs-product-quick-view-lightbox.sqs-modal-lightbox {
font-family: 'Futura PT' !important;
font-size: 0.8rem;
}