.nav{width:750rpx;background-color:#fff;position:fixed;top:0;z-index:11}.nav .backBtnSty{width:40rpx;height:40rpx;margin-left:15rpx;margin-top:50rpx}.nav .backBtnSty image{width:40rpx;height:40rpx}.nav .navTit{width:260rpx;height:44px;margin:auto;color:#fff;text-align:center;display:flex;justify-content:space-around}.nav .navTit .postTit{height:40px;color:#000;font-weight:700;display:inline-block;vertical-align:bottom}.tab-item-active{color:#fff!important;font-size:18px;font-weight:700}