.city-cooperation {
  height: 244px;
  position: relative;
  margin-bottom: 28px;
}

.city-cooperation .bg {
  width: 100%;
  height: 100%;
}

.city-cooperation .caption-wrap {
  display: table;
  position: absolute;
  left: 0;
  bottom: 0;
  height: 56px;
  width: 230px;
  background-color: rgba(0, 0, 0, 0.7);
  color: #fff;
  transition: all 0.3s;
}

.city-cooperation .caption-wrap .caption {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  opacity: 1;
  transition: 0s 0.3s;
}

.city-cooperation .caption-wrap .detail {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  opacity: 0;
  font-size: 0;
  line-height: 2;
}

.city-cooperation:hover .caption-wrap {
  height: 100%;
  width: 100%;
  transition: 0.6s;
}

.city-cooperation:hover .caption {
  opacity: 0;
  font-size: 0;
  transition-delay: 0s;
}

.city-cooperation:hover .detail {
  font-size: 14px;
  opacity: 1;
  transition: opacity 0.4s 0.3s, font-size 0s 0.4s;
}