.t-feed__post-popup__relevants-imgwrapper {
  padding-bottom: 60% !important;
}

.t-feed__post-popup__relevants-item-title {
  font-size: 24px !important; /* поставь нужный размер */
   line-height: 1 !important;
}

/* Десктоп */
.t-feed__post-popup__title {
  font-size: 50px !important;
  line-height: 1.2 !important;
}

/* Мобильный */
@media (max-width: 768px) {
  .t-feed__post-popup__title {
    font-size: 36px !important;
    line-height: 1.2 !important;
  }
}