.t_nav{ color: #313131; position:fixed;top:0;left:0; width:100%;z-index:9999; background-color: #fff;font-size: 30rpx  }
.title_set{ }
.tab{ font-size:24rpx; display: flex;;align-items: flex-end;width: 100% }
.contant{ display: flex; justify-content: center; align-items: center; width: 100%; }