.banner-box{
  width: 100%;
  height: auto;
}
.banner-pc{
    width: 100%;
    object-fit: cover;
}
.banner-m{
    display: none;
    width: 100%;
    object-fit: cover;
}

@media screen and (max-width:800px) {
    .banner-pc{
        display: none;
    }
    .banner-m{
        display: block;
        width: 100%;
    }
}