body {
  font-family: "Avenir Next";
}

h1{
  display: none;
  text-align: center;
}

@media screen and (min-width:768px) {/* PC */
  h1 {margin-top: 0px;
    font-size: 16rem;
  }

}

@media screen and (max-width:767px) {/* iphone */
  h1 {margin-top: 70px;
    font-size: 7rem;
  }
}