.content-wrap{
    position: relative;
    background:url('../img/class_top.png') center top no-repeat,
    url('../img/class_bottom.png') center bottom no-repeat;
    background-size:1231px auto;
    }
.line-wrap{
    position: absolute;center;top:127px;bottom:75px;z-index:-1;
    width:100%;
    background:url('../img/class_bg.png') center top repeat-y;
    background-size:1231px auto;
    }
.content-wrap-lb{
    position: relative;
    background:url('../img/news_top.png') center top no-repeat,
    url('../img/news_bottom.png') center bottom no-repeat;
    background-size:1296px auto;
    }
.line-wrap-lb{
    position: absolute;center;top:110px;bottom:75px;z-index:-1;
    width:100%;
    background:url('../img/news_bg.png') center top repeat-y;
    background-size:1296px auto;
    }

.huigu {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-items: flex-start;
}

.huigu a {
  width: 20%;
  margin-bottom: 5px;
}

.huigu a img {
  width: 98%;
}