[data-product-url*="https://skywool.ru/katalog/mk/"] .t-catalog__prod-popup__info .t-catalog__prod-popup__btn td {
  position: relative;
  color: transparent;
  min-width: 150px;
}
[data-product-url*="https://skywool.ru/katalog/mk/"] .t-catalog__prod-popup__info .t-catalog__prod-popup__btn td::before{
    content:"Полный мастер-класс";
    position: absolute;
    display:block;
    color: #fff;
    text-align: center;
  width: 100%;
}