серый стиль Slack.com - stylish расширение для браузера

@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("slack.com") {
  body{
    background-color: gainsboro !important;
  }

  #footer{
    background-color: gainsboro !important;
  }

  #channel_header_info{
    background-color: gainsboro !important;
  }

  #client_body:not(.onboarding)::before{
    background-color: gainsboro !important;
  }

  .channel_title_info{
    background-color: gainsboro !important;
  }

  .flex_header{
    background-color: gainsboro !important;
  }

  #search_terms{
    background-color: #eaeaea !important;
  }

  #primary_file_button{
    background-color: #eaeaea !important;
  }

  #message-input{
    background-color: #eaeaea !important;
  }

  ts-message:hover{
    background-color: #e2e2e2 !important;
  }
}