.banner-pc {
  display: none;
}
.banner-mb{
  display: block;
}
.banner-mb img{
  width: 100%;
}

.banner-pc img{
  width: 100%;
}
@media screen and (min-width: 1000px) {
  .banner-mb{
    display: none;
  }
  .banner-pc {
    display: block;
  }
}