body {
  position: relative;
  width: 100%;
  height: 100vh;
  background-color: #FF0000;
}

img {
  width: 100%;
  display: block;
}

@media screen and (min-width: 769px) {
  pc {
    display: block;
  }
  sp {
    display: none;
  }
  .enter {
    position: absolute;
    top: 10%;
    right: 0;
    bottom: 0;
    left: 0;
    margin: auto;
    width: 20.5%;
  }
}

@media screen and (max-width: 768px) {
  pc {
    display: none;
  }
  sp {
    display: block;
  }
  .enter {
    position: absolute;
    top: 5%;
    right: 0;
    bottom: 0;
    left: 0;
    margin: auto;
    width: 66.5%;
  }
}