.img {
  width: 100%;
}
.top {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  width: 100%;
}
.top .bg {
  width: 100%;
  z-index: 100;
}
.top .icon1 {
  position: absolute;
  width: 16vw;
  height: 16vw;
  z-index: 101;
  top: 1.3vw;
  left: 2vw;
}
.top span {
  z-index: 101;
  color: #fff;
  font-size: 4vw;
  position: absolute;
  top: 1.2vw;
  left: 20vw;
  font-weight: bold;
}
.top .top_download {
  position: absolute;
  top: 3vw;
  right: 0;
  width: 32vw;
  height: 13vw;
}
.content {
  z-index: 1;
  margin-top: 18%;
  width: 100%;
}

.download_content {
  position: relative;
}
.download_content .bg {
  z-index: 5;
  width: 100%;
  height: 13vw;
}
.download_content .btn {
  position: absolute; 
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  height: 13vw;
  width: 36vw;
  z-index: 6;
}
.download_content .btn img {
  width: 100%;
  height: 100%;
}