.app-background {
    background-color  #1c1c1c 
    height  100vh 
  }
  body,
  .mobile-chat,
  .van-sticky,
  .van-nav-bar,
  .van-list,
  .message-list-box
  .van-cell,
  .chat-box,
  .van-cell-group,
  .van-field {
    background-color  #1c1c1c !important 
    color  #fff !important 
  }
  .chat-box-wrapper {
    position  fixed 
    bottom  0 
    width  100% 
    background-color  #1c1c1c 
    }
  .icon-box .van-icon,
  .mobile-chat .van-nav-bar__title .van-dropdown-menu__title,
  .mobile-chat .van-nav-bar__title .van-cell__title,
  .mobile-chat .van-nav-bar__right .van-icon {
    color  #fff !important 
  }
  .mobile-chat {
    .van-nav-bar__title {
      .van-dropdown-menu__title {
        margin-right  15px 
      }
      .van-cell__title {
        text-align  left 
      }
    }
    .chat-list-wrapper {
      position  fixed 
      top  50px 
      bottom  60px 
      width  100vw 
      overflow-y  scroll 
    }
    .van-nav-bar__right {
      .van-icon {
        font-size  20px 
      }
    }
  }