.public-benfit-box{ width: 100%; position: relative; }
.public-benfit-box a.dw-click{ display: block; width:30%; position: absolute; left: 50%; margin-left: -15%; top:48%; }
.public-benfit-box a>img{ display: block;width: 100%; }
.public-benfit-box img{ display: block; width: 100%; }