.about-us-main-section {
  border-radius: 70px 70px 0 0;
  margin-top: -70px;
  z-index: 10;
}

/* footer */
#footer>section {
  background: #dadada;
}

/* mobile */
@media(max-width:48em) {
  .about-us-main-section {
    border-radius: 35px 35px 0 0;
    margin-top: -45px;
    z-index: 10;
  }
}