.mainimg{
  background-color: rgba(51,51,51,1.0);
}
.mainimg .title{
  color: rgba(255,255,255,1.0);
  left:25px;top:50px;width:550px;white-space:nowrap;
}
.mainimg .describe{
  color: rgba(255,255,255,1.0);
  left:25px;top:95px;
}
.mainimg .googleplay{
  left:480px;top:400px;
}
.mainimg .appstore{
  left:690px;top:400px;
}
@media screen and (max-width: 899px) {
  .mainimg{
    height:450px;
  }
  .mainimg .googleplay{
    left:75px;top:350px;
  }
  .mainimg .appstore{
    left:325px;top:350px;
  }
}
@media screen and (max-width: 599px) {
  .mainimg{
    height:300px;
  }
  .mainimg .title{
    left:0px;top:25px;width:300px;
    text-align:center;
  }
  .mainimg .describe{
    left:0px;top:190px;
    text-align:center;
  }
  .mainimg .googleplay{
    left:10px;top:235px;
    width:125px;height:50px;
  }
  .mainimg .appstore{
    left:165px;top:235px;
    width:125px;height:50px;
  }
}