position: absolute; bottom: .3rem; left: 50%; margin-left: unit(-5.2/2,rem); width: 5.2rem; height: 3.6rem; background: url("../img/zf_phoneListen.png") no-repeat; background-size: 100% 100%;
position: absolute; bottom: .3rem; left: 50%; margin-left: unit(-5.2/2,rem); width: 5.2rem; height: 3.6rem; background: url("../img/zf_phoneListen.png") no-repeat; background-size: 100% 100%;
原文：https://www.cnblogs.com/zzzzzzzsy/p/8352885.html