.content {
  padding: 4.5% 0;
}
.content .common_top {
  margin-bottom: 60px;
}

.list {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
}
.list .repeat {
  margin-right: 15px;
  padding: 10px;
  width: calc((100% - 45px) / 4);
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}
.list .repeat:hover {
  background: #f5f5f5;
}
.list .repeat:hover .img img {
  -webkit-transform: scale(1.05);
      -ms-transform: scale(1.05);
          transform: scale(1.05);
}
.list .repeat:nth-child(4n) {
  margin-right: 0;
}
.list .repeat:nth-child(n+5) {
  margin-top: 60px;
}
.list .img {
  position: relative;
  height: 0;
  padding-bottom: 59.375%;
  overflow: hidden;
  display: block;
  background: #fff;
}
.list .img img {
  position: absolute;
  max-height: 90%;
  max-width: 90%;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  -o-object-fit: cover;
     object-fit: cover;
  background-size: cover;
}
.list .repeat_tit {

  margin: 16px 0 12px;

}
.list .des {
  overflow: auto;
  line-height: 1.875;
  height: 5.625em;
  color: #222222;
}
.list .des::-webkit-scrollbar {
    width: 2px;
    border-radius: 4px;
}
.list .des::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.02); 
    /* 背景色 */
    border-radius: 4px;
}
.list .des::-webkit-scrollbar-thumb {
  background: #f00000;
  /* 滚动色 */
  border-radius: 6px;
}
@media screen and (max-width: 1600px) {
  .list .repeat:nth-child(n+5) {
    margin-top: 20px;
  }
  .content .common_top {
    margin-bottom: 35px;
  }
}
@media screen and (max-width: 1200px) {
  .content .common_top {
    margin-bottom: 25px;
  }
}
@media screen and (max-width: 768px) {
  .list {
    -webkit-box-pack: justify;
        -ms-flex-pack: justify;
            justify-content: space-between;
  }
  .list .repeat {
    width: calc((100% - 15px) / 2);
    margin-right: 0;
  }
  .list .repeat:nth-child(n+3) {
    margin-top: 20px;
  }
}
@media screen and (max-width: 600px) {
  .content {
    padding: 40px 0;
  }
  .list .repeat {
    width: 100%;
    padding: 0;
  }
  .list .tit {
    margin: 25px 0 8px;
  }
  .list .repeat:nth-child(n+2) {
    margin-top: 20px;
  }
  .list .repeat:hover {
    background: inherit;
  }
}