.video-main {
  position: relative;
  padding-bottom: 45%;
  margin-bottom: 20px;
}
.video-main iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.box-cus-link {
  display: none;

}
.box-cus-link a {
  color: #4f4f4f;
  margin-left: 15px;
}
._advs_left a{
  display: block;
  margin-bottom: 10px;
}
@media only screen and (max-width: 768px) {
  .video-main {
    padding-bottom: 65%;
  }
  .box-cus-link {
    display: flex;

  }
}