challenge-landing-page-thiago-dutra/style/main.css

.main-banner .banner-img {
  display: block;
  width: 100%;
}

.main-banner .banner-mobile {
  display: none;
}

@media (max-width: 720px) {
  .main-banner .banner-desktop {
    display: none;
  }
  .main-banner .banner-mobile {
    display: block;
  }
} ;