@media screen and (max-width: 1080px) { 
.banner-pc {
   display: none;
}

   .banner a img {
     display: block;
  width:7.8rem;
height: auto;
margin: 0 auto;
}
}

@media screen and (min-width: 1081px) { 
.banner-mb {
   display: none;
}
   .banner a img {
        display: block;
  width:900px;
height: 150px;
margin: 0 auto;
    }
}