.btn{text-align: center;height: 0.78rem;position:absolute;width:100%;}
.btn a{display: inline-block;width:2.3rem;height: 0.78rem;}
.btn .ios_btn{background: url('http://static.zplay.cn/wap/activity/demonWars/img/weixin/ios_download.png') no-repeat center;background-size: 100%;margin-right: 0.2rem;}
.btn .android_btn{background: url('http://static.zplay.cn/wap/activity/demonWars/img/weixin/android_download.png') no-repeat center;background-size: 100%;}