html,
body {
  min-width: 0;
  max-width: 750px;
  width: 100%;
  min-height: 100vh;
}
.container {
  width: 100%;
  max-width: 750px;
  margin: 0 auto;
  font-size: 0;
  text-align: center;
  height: 100vh;
  max-height: 15.12rem;
  background: #e2e3e8 url(../images/download/phone-bg.jpg) no-repeat center bottom;
  background-size: 100% 15.12rem;
}
.container .btn-cover {
  overflow: hidden;
  position: fixed;
  left: 0;
  right: 0;
  top: 11.47rem;
}
.container a.btn {
  display: block;
  margin: 0 auto;
  width: 5.5rem;
  height: 0.88rem;
  background: #a61e28;
  border-radius: 0.44rem;
  text-align: center;
  font-size: 0;
  color: #fff;
}
.container a.btn span {
  display: inline-block;
  height: 0.88rem;
  line-height: 0.88rem;
  padding-left: 0.43rem;
  background: url(../images/download/phone-icon-2.png) no-repeat left center;
  background-size: 0.18rem 0.28rem;
  font-size: 0.24rem;
}
.container .fixed-cover {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  max-width: 7.5rem;
  margin: 0 auto;
}
.container .fixed-cover .fixed-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 11;
  background: rgba(0, 0, 0, 0.76) !important;
  filter: alpha(opacity=76);
  background: #000;
}
.container .fixed-cover .fixed-share {
  position: absolute;
  top: 0.45rem;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 12;
  height: 3.33rem;
  background: url(../images/download/share-icon.png) no-repeat center;
  background-size: auto 3.33rem;
}