.banner-grid {
    overflow: hidden;
}
.banner-grid > a > img {
  -webkit-transform: scale(1);
  transform: scale(1);
  -webkit-transition: .3s ease-in-out;
  transition: .3s ease-in-out;
}
.banner-grid > a > img:hover{
  -webkit-transform: scale(1.3);
  transform: scale(1.3);
}