.about-banner .banner--mobile-img {
  display: none;
}
.about-banner .banner--desktop-img {
  display: block;
  border-radius: 8px;
}

@media only screen and (max-width: 749px) {
  .about-banner .banner--mobile-img {
    display: block;
  }
  .about-banner .banner--desktop-img {
    display: none;
  }
}