/* 返回上一页 */ .navigation{ position: fixed; top: 0; left: 0; z-index: 99; width: 100%; height: 90rpx; background-color: transparent; transition: .2s; } .navigation.active { background-color: transparent; } .navigation-arrow { width: 44rpx; height: 44rpx; margin: 20rpx 15rpx 0 20rpx; } .img { width: 100%; display: block; }