.section-image-only {
  width: 100%;
}
.section-image-only img {
  display: block;
  width: 100%;
  height: auto;
  height: initial;
}
.section-image-only img.mobile {
  display: none;
}
@media screen and (max-width: 750px) {
  .section-image-only img {
    display: none;
  }
  .section-image-only img.mobile {
    display: block;
  }
}