.classroom-wrap {
  padding-top: 60px;
  padding-bottom: 120px;
}
.classroom-wrap header {
  text-align: center;
  margin-top: 30px;
}
.classroom-wrap h2 {
  font-size: 54px;
  font-family: Source Han Sans SC;
  font-weight: bold;
  color: #053991;
  line-height: 1;
  margin: 0;
  transform: translateY(-70px);
}
.classroom-wrap small {
  font-size: 80px;
  font-family: Impact;
  font-weight: 400;
  color: #053991;
  line-height: 145px;
  opacity: 0.1;
}
.classroom-wrap .controller {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  height: 50px;
  display: flex;
  align-items: center;
}
.classroom-wrap .col {
  cursor: pointer;
  padding: 15px;
  box-sizing: border-box;
}
.classroom-wrap .wrap {
  box-shadow: 2px 2px 10px 0 rgba(77, 77, 77, 0.2);
  border-radius: 15px;
  overflow: hidden;
}
.classroom-wrap .cover {
  position: relative;
  border-top-left-radius: 15px;
  border-top-right-radius: 15px;
  overflow: hidden;
  height: 190px;
}
.classroom-wrap .col:hover .cover::before {
  opacity: 2;
}
.classroom-wrap .cover::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(51, 51, 51, 0.4);
  opacity: 1;
  transition: all .3s ease;
}
.classroom-wrap .cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.classroom-wrap .col:hover .cover .play {
  transform: scale(1.2);
}
.classroom-wrap .cover .play {
  position: absolute;
  bottom: 20px;
  left: 20px;
  /*transform: translate(-50%, -50%);*/
  opacity: 1;
  transition: all .3s ease;
}
.classroom-wrap .cover .play > img {
  width: 50%;
  height: 50%;
  /*margin: 0 auto;*/
}
.classroom-wrap .desc {
  padding: 24px;
  background: #FFFFFF;
  border-radius: 0px 0px 10px 10px;
}
.classroom-wrap .desc p {
  font-size: 16px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #4D4D4D;
  margin: 0 0 26px;
  height: 50px;
}
.classroom-wrap .desc .bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.classroom-wrap .desc .left {
  font-size: 14px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #999999;
  display: flex;
  align-items: center;
}
.classroom-wrap .desc img {
  width: 25px;
  margin-right: 5px;
}
.classroom-wrap .desc .right {
  font-size: 14px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #999999;
}