.abs_center{position: absolute;left:10%;right:10%;top:35%;text-align:center; -webkit-transform: translate(0,-50%); transform: translate(0,-50%);}
.system_btn{width:100%;height: 35px;line-height:35px;border-radius:4px;color:#fff;background-color:#3897f5;margin-top: 20px;font-size:21px;}
.center{
  text-align: center;
}
.tips{
  font-size:16px;
  color: rgba(165, 164, 167, 0.94);
}