.class li.clear {
  background: none;
}

.class {
  width: 100%;
  border-bottom: 1px solid #d9d9d9;
  padding-top: 22px;
  overflow: auto;
}

.class li {
  float: left;
  font-size: 16px;
  background: url(../img/bor.png) no-repeat right;
  padding-right: 25px;
  margin-right: 25px;
}

.class li a {
  display: inline-block;
  text-align: center;
  width: 120px;
  height: 48px;
  line-height: 48px;
}

.class li a.active {
  background: #d30000;
  color: #fff;
}

.video {
  width: 100%;
  margin: 5% 0;
}

.video ul {
  overflow: auto;
}

.video li {
  float: left;
  min-height: 100px;
  width: 32.33%;
  margin-right: 1.5%;
  margin-bottom: 1%;
  box-sizing: border-box;
}
.video li:nth-child(3n+3) {
  margin-right: 0;
}

.video_item {
  background: #f5f5f5;
}

.video_item .thumb {
  position: relative;
  max-height: 363px;
  overflow: hidden;
}

.video_item .thumb .pic {
  display: block;
  width: 100%;
}

.video_item .thumb .bg {
  background: #000;
  opacity: 0.2;
  -webkit-opacity: 0.2;
  -moz-opacity: 0.2;
  -ms-opacity: 0.2;
  -o-opacity: 0.2;
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
}

.video_item .thumb i {
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 0;
  right: 0;
  margin: -30px auto;
  text-align: center;
}

.video_item .item {
  padding: 5%;
}

.video_item .item span {
  display: block;
  font-size: 20px;
  color: #55504f;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

.video_item .item p {
  display: block;
  font-size: 15px;
  color: #797979;
  height: 42px;
  overflow: hidden;
  margin-top: 10px;
}

.video_item:hover .item {
  background: #d30000;
}
.video_item:hover .item span {
  color: #ffffff;
}

@media (max-width: 1024px) {
  .video_item .item p {
    font-size: 12px;
    height: 53px;
  }
}
@media (max-width: 768px) {
  .video_item .item span {
    font-size: 16px;
  }
  .video li {
    float: inherit;
    width: 100%;
    margin-right: 0 !important;
    margin-bottom: 2%;
    margin-left: 0 !important;
  }
}
@media (max-width: 640px) {
  .video_item .item p {
    height: auto;
  }
}
@media (max-width: 480px) {
  .video_item .thumb i {
    margin-top: -20px;
  }
  .video_item .thumb i img {
    width: 40px;
  }
  .video_item .item span {
    font-size: 15px;
  }
  .video {
    margin: 10% 0;
  }
}