.main_footer {
  background-size: cover;
  background-position: center;
  background-image: url("../../img/3128115/footer_3128115_.jpg");
}

@media (max-width: 768px){
  .main_footer {
    background-size: cover;
    background-position: 50% 0%;
    background-image: url("../../img/3128115/footer_3128115_sp.jpg")0 0 no-repeat;
    -webkit-background-size: cover;
    -moz-background-size: cover;
  }

}