.top { float: left; width: 100%; background-color: #ffffff; } .top .left { float: left; width: 15%; text-align: center; overflow: hidden; } .top .left .back { width: 40rpx; height: 40rpx; position: relative; left: 15px; width: 40rpx; height: 40rpx; } .top .cen { float: left; width: 70%; text-align: center; font-size: 36rpx; color: #000000; font-weight: 600; } .top .right { float: left; width: 15%; }