.mainer {
  padding: 60px 100px;
}
.mainer .list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 50px;
  /* 网格项之间的间隙 */
}
.mainer .list .item {
  background: #ffffff;
  box-shadow: 0px 0px 30px 0px rgba(33, 41, 50, 0.05);
  border-radius: 10px;
  border: 4px solid transparent;
}
.mainer .list .item:hover {
  border: 4px solid var(--primary-color);
}
.mainer .list .item .pic {
  height: 260px;
  background-image: url(../images/article-list/nopic.gif);
  background-repeat: no-repeat;
  background-size: 100% 100%;
}
.mainer .list .item .web {
  padding: 34px;
}
.mainer .list .item .web .title {
  height: 24px;
  line-height: 24px;
  
  font-weight: 500;
  font-size: 24px;
  color: #333333;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}