.pic{display: block;
    padding-top:140%;
    position: relative;
    overflow: hidden;}
  .m-bg{  position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;}
    .sz{width:48%;float:left;padding:0 1% !important;text-align: center;    border-bottom: none !important;}