.header{width:100%;position:fixed;top:0;left:0;z-index:999;height:100rpx;line-height:100rpx;box-sizing:initial}.header .title{position:relative;text-align:center;color:#1c2f54;font-size:36rpx;font-weight:600}.header .title .back{width:20rpx;height:36rpx;position:absolute;left:28rpx;top:50%;-webkit-transform:translateY(-50%);transform:translateY(-50%)}