.roc-banner-img-box {
 /** border-top: 1px solid #fff;*/
}
.roc-banner-img-box img {
  width: 100%;
}
.roc-vd-img-box {
  position: relative;
  margin-bottom: 10px;
  height: 172px;
}
.roc-vd-img-box img {
  width: 100%;
  height: 100%;
}
.roc-icon-play {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 2;
  margin-left: -20px;
  margin-top: -20px;
  width: 40px;
  height: 40px;
  overflow: hidden;
  text-indent: -9999em;
  background: url(/images/icon-play.png) no-repeat;
  background-size: 40px 40px;
  transition: all 0.3s;
}
.roc-play-mask {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  background-color: #000;
  transition: all 0.3s;
  opacity: 0.5;
}
.roc-vd-info-box h2 {
  margin: 0;
  font-size: 16px;
  color: #2a2a2a;
  padding-bottom: 6px;
}
.roc-vd-info-box p {
  margin: 0;
  font-size: 12px;
  color: #4b4b4b;
}
.roc-vd-item {
  margin-bottom: 30px;
}
.roc-vd-item:hover .roc-icon-play {
  transform: scale(1.2);
  opacity: 0.6;
}
.roc-vd-item:hover .roc-play-mask {
  opacity: 0.3;
}

@media (max-width: 1200px) {
  .roc-vd-img-box {
    height: 152px;
  }
}
@media (max-width: 992px) {
  .roc-vd-img-box {
    height: 132px;
  }
}
@media (max-width: 768px) {
  .roc-vd-img-box {
    height: 112px;
  }
}