.bg {
  width: 10rem;
  height: 17.8rem;
  position: relative;
  margin: 0 auto;
}
.bg1 {
  background: url(../images/bg1.png) no-repeat;
  background-size: 100% 100%;
}
.bg2 {
  background: url(../images/bg2.png) no-repeat;
  background-size: 100% 100%;
}
.bg3 {
  background: url(../images/bg3.png) no-repeat;
  background-size: 100% 100%;
}
.top {
  width: 7.1rem;
  position: absolute;
  left: 1.45rem;
  top: 1rem;
}
.text {
  position: absolute;
  width: 3.62rem;
  left: 3.19rem;
  top: 16rem;
}
.down-btn {
  width: 6.8rem;
  height: 1.6rem;
  background: url(../images/downBtn.png) no-repeat;
  background-size: 100% 100%;
  position: absolute;
  left: 1.6rem;
  top: 2rem;
}
.bottom-bg {
  width: 10rem;
  height: 4.42rem;
  position: fixed;
  background: url(../images/bottom-bg.png) no-repeat;
  background-size: 100% 100%;
  bottom: 0;
  left: 0;
  z-index: 500;
}