.content .ios, .content .android {
  position: absolute;
  left: 27%;
  width: 13%;
}
.content {
  position: absolute;
  top: 80px;
  left: 0;
}
.ios {
  top: 69%;
}
.android {
  top: 53%;
}
.tips {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(12,12,12,.7);
  font-size: 16px;
  z-index: 10;
}
.tips .tipBox {
  padding: 0 30px;
  width: 300px;
  height: 241px;
  line-height: 70px;
  border-radius: 10px;
  position: absolute;
  top: 35%;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: #000;
  background: #FFF;
}
.tips img:first-child {
  float: right;
}
.tips .top {
  overflow: hidden;
  padding-top: 20px;
  height: 80px;
}
.tips button {
  border: 1px solid #000;
  width: 138px;
  font-size: 16px;
  background: #fff;
  height: 35px;
  line-height: 35px;
}
.bg img {
  display: block;
}
.bg .com_img {
  width: 100%;
}
.bg1 {
  background: url('../images/index_1.jpg');
  background-repeat: no-repeat;
  background-size:100% 100%; 
  height: 347px;
  position: relative;
}
.back {
  width: 80px;
  height: 40px;
  cursor: pointer;
  overflow: hidden;
  position: fixed;
  top: 50%;
  right: 0;
  display: none;
}
#about_us, #intro {
  padding-top: 80px;
  margin-top: -80px;
}