.video-box {
    transition: opacity 1s;
  }

  .video-banner-ul {
    position: absolute;
    display: flex;
    justify-content: center;
    bottom: 30px;
    width: 100%;
    z-index: 1;
  }

  .video-banner-ul .video-banner-item {
    width: 23px; 
    height: 8px; 
    background-color: #666666; 
    margin-left: 15px;
    cursor: pointer;
    transition: background-color .5s;
  }

  .video-banner-ul .video-banner-item-active {
    background-color: #0f6ab4;
    transition: background-color .5s;
  }