.banner {
  width: 949px;
  height: 534px;
}

.contentlist {
  margin-top: 10px;
}

.contentlist ul {
  width: 949px;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
}

.contentlist ul li {
  width: 287px;
  height: auto;
  background: #ffffff;
  list-style-type: none;
  padding: 11px;
}

.videobag {
  position: relative;
}

.videoplay {
  position: absolute;
  margin:0;
  padding:0;
  width: 287px;
  height: 193px;
  background: url('../images/play-line.jpg') center/cover no-repeat;
  opacity: 0.3;
}

.contentlist ul li:not(:nth-child(3n)) {
  margin-right: 11px;
}

.cimg {
  width: 287px;
  height: 193px;
  overflow: hidden;
}

.cimg img {
  width: 100%;
  /* 图片宽度设置为容器的100% */
  height: 100%;
  /* 图片高度设置为容器的100% */
  object-fit: cover;
  /* 保持图片原始宽高比 */
}

.ctitle {
  margin-top: 15px;
  color: #252525;
}

.ctitle em {
  font-size: 18px;
  font-style: normal;
  font-weight: bold;
  height: 48px;
  color: #252525;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  /* 限制为 3 行 */
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ctitle span {
  height: 42px;
  margin-top: 5px;
  line-height: 20px;
  color: #252525;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  /* 限制为 3 行 */
  -webkit-box-orient: vertical;
  overflow: hidden;
}