stylus-twitter.css

/* styles for collapsing media in tweets and showing an arrow to indicate their existence
     but only at the top level */

  li.stream-item .has-content .AdaptiveMedia,
  li.stream-item .has-cards .card2 {
    display: none;
  }

  li.stream-item .has-content:after,
  li.stream-item .has-cards:after,
  li.stream-item .js-pinned .user-pinned:after {
    display: block;
    position: absolute;
    bottom: .65em;
    right: 10px;
    color: #CCD6DD;
    font-size: 1.25rem;
    content: '\279a';
  }

  li.stream-item:hover .has-content:after,
  li.stream-item:hover .has-cards:after,
  li.stream-item:hover .js-pinned .user-pinned:after {
    color: #069;
  }

  /* indents followup tweets in a conversation chain in the main timeline */
  ol.conversation-module li:not(.conversation-root) {padding-left: 1.5em;}
  
  /* So long, Moments tab */
  li.moments.js-moments-tab {display: none !important;}

New version of twitter-stylish.css, since I’ve converted to Stylus (a fork of Stylish).