.banner {
  width: 100%;
  height: 600px;
}
.coupon-box {
  position: fixed;
  left: 20px;
  bottom: 20px;
  z-index: 9999999;
  width: 200px;
  height: 117px;
}
.coupon-box img {
  width: 200px;
  height: auto;
  cursor: pointer;
}
.coupon-box .close {
  display: block;
  height: 20px;
  width: 20px;
  background: url("../images/spring-close.png") no-repeat center;
  background-size: 100%;
  cursor: pointer;
  margin: auto;
  margin-top: 10px;
}