.intro {
  background-image: none !important;
}

@media screen and (min-width: 751px) {
  section.intro {
    background-size: 346px auto;
    padding: 50px 40px;
    background-position: right 60px top 10%;
    background-image: url(../img/jewellery-kaitori/img_minamino_intro.png) !important;
  }
}