#oct-banner {
  width: auto;
  height: auto;
  max-height: 231px;
  aspect-ratio: 75 / 14;
  max-width: calc(100% - 30px);
  background-image: url(../../../images/25/oct/banner/back.jpg);
  background-image: -webkit-image-set(
    url("../../../images/25/oct/banner/back.jpg") 1x,
    url("../../../images/25/oct/banner/back@2x.jpg") 2x
  );
  background-size: cover;
  background-position: center bottom;
  background-repeat: no-repeat;
  margin-bottom: 25px;
  margin-top: 25px;
}
#oct-banner .button {
  bottom: 25%;
  left: 35%;
  width: 30%;
  height: 20%;
}
@media screen and (max-width: 767px) {
  #oct-banner {
    margin-top: 17px;
    width: auto;
    height: auto;
    max-height: 600px;
    aspect-ratio: 125 / 194;
    background-image: url(../../../images/25/oct/banner/back-m.jpg);
    background-image: -webkit-image-set(
      url("../../../images/25/oct/banner/back-m.jpg") 1x,
      url("../../../images/25/oct/banner/back-m@2x.jpg") 2x
    );
    background-size: cover;
    background-position: center bottom;
    background-repeat: no-repeat;
  }
  #oct-banner .button {
    bottom: 5%;
    left: 12%;
    width: 73%;
    height: 7%;
  }
}