.video-one {
  width: calc((100% - 60px)/4);
  margin: 0 20px 20px 0;
  cursor: pointer;
  display: block;
  padding: 4px;
}
.video-one:nth-child(4n) {
  margin-right: 0;
}
.video-one .course-img {
  width: 100%;
  margin-bottom: 10px;
  transition: var(--tran150-easeout);
  border-radius: 3px;
}
.video-one .content-box {
  padding: 10px;
}
.video-one .content-box .text-20-28 {
  color: var(--color--text2);
  margin-bottom: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
}
.video-one .content-box .text-16-24 {
  color: var(--color--text1);
  height: 48px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  margin-bottom: 10px;
}
.video-one .content-box .left-score span {
  background: rgba(160, 168, 174, 0.1);
  background-blend-mode: multiply;
  border-radius: 3px;
  margin-right: 2px;
  color: #818195;
  padding: 4px;
}
.video-one:hover .course-img {
  transform: translateY(-4px);
  transition: var(--tran150-easeout);
}
.tab-content {
  margin-top: 0 !important;
}
.empty-page {
  margin-top: 0px;
}
@media screen and (max-width: 1600px) {
  .video-one {
    width: calc((100% - 40px)/3);
  }
  .video-one:nth-child(3n) {
    margin-right: 0;
  }
}