.single-banner__image img {
  width: 100%;
  height: auto;
  display: block;
}
.single-banner__image .desktop_image{
  display:none;
}
.single-banner__image .mobile_image{
  display:block;
}
@media (min-width:769px){
  .single-banner__image .desktop_image{
    display:block;
  }
  .single-banner__image .mobile_image{
    display:none;
  }
}