.banner-area {
  width: 600px;
  margin: 30px auto;
  overflow: hidden;
}
@media screen and (max-width: 640px) {
  .banner-area {
    width: 290px;
    margin: 30px auto 20px;
  }
}
.banner-area .bnr {
  float: left;
  width: 290px;
}
.banner-area .bnr:first-child {
  margin-right: 20px;
}
@media screen and (max-width: 640px) {
  .banner-area .bnr {
    float: none;
  }
}
.banner-area .bnr a {
  display: block;
}
.banner-area .bnr a:hover {
  opacity: 0.8;
}