.topBg{background:url(../images/caseBg.png) no-repeat;}
.cases ul {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    color: #454545;
    padding-bottom: 80px;
  }
  .cases ul > li {
    width: 23%;
    margin-bottom: 40px;
    background: #fff;
    padding: 25px;
    box-sizing: border-box;
    box-shadow: -4px -4px 8px 0 rgba(1, 1, 2, 0.1),
      4px 4px 8px 0 rgba(1, 1, 2, 0.1);
    border-radius: 15px;
  }
  .cases ul > li img {
    height: 145px;
    width: 100%;
    display: block;
    border-radius: 10px;
  }
  .cases ul > li h4 {
    text-align: center;
    margin-top:25px;margin-bottom:15px;font-size: 23px;font-family: 'SourceHanSansCN-Bold';
  }
  .cases ul > li p {
    font-size: 20px;
    line-height: 32px;font-family: 'SourceHanSansCN-Regular';
    height:96px;
  }
  .cases ul > li a {
    display: block;
    margin-top: 30px;
    color: #4276d8;
  }