.mp-back-bar{box-sizing:border-box;height:44px;margin:0 auto;max-width:500px;padding:0 45px;position:fixed;width:100%;z-index:200}.mp-back-bar-icon{font-size:12px;left:20px;position:absolute;top:12px;fill:#fff}.mp-back-bar-icon img{height:16px;margin-top:2px;width:16px}.mp-back-bar-text{color:#fff;font-size:20px;font-weight:500;line-height:44px;text-align:center;width:100%}