osr-discourse-src/plugins/chat/assets/javascripts/discourse/components/chat-skeleton.hbs

<div class="chat-skeleton -animation">
  <div class="chat-skeleton__header">
    <div class="chat-skeleton__header-img"></div>
    <div class="chat-skeleton__header-name"></div>
  </div>

  <div class="chat-skeleton__body">
    <div class="chat-skeleton__message">
      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -small"></div>
        <div class="chat-skeleton__message-msg -line2 -large"></div>
      </div>

      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -large"></div>
        <div class="chat-skeleton__message-msg -line2 -large"></div>
      </div>
    </div>
  </div>

  <div class="chat-skeleton__header">
    <div class="chat-skeleton__header-img"></div>
    <div class="chat-skeleton__header-name"></div>
  </div>

  <div class="chat-skeleton__body">
    <div class="chat-skeleton__message">
      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -medium"></div>
        <div class="chat-skeleton__message-msg -line2 -large"></div>
      </div>
    </div>

    <div class="chat-skeleton__message">
      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -medium"></div>
        <div class="chat-skeleton__message-msg -line2 -large"></div>
      </div>
    </div>

    <div class="chat-skeleton__message">
      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -small"></div>
        <div class="chat-skeleton__message-msg -line2 -large"></div>
      </div>
    </div>

    <div class="chat-skeleton__message">
      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -medium"></div>
        <div class="chat-skeleton__message-msg -line2 -small"></div>
      </div>
    </div>

    <div class="chat-skeleton__message">
      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -medium"></div>
        <div class="chat-skeleton__message-msg -line2 -medium"></div>
      </div>
    </div>
  </div>

  <div class="chat-skeleton__header">
    <div class="chat-skeleton__header-img"></div>
    <div class="chat-skeleton__header-name"></div>
  </div>

  <div class="chat-skeleton__body">
    <div class="chat-skeleton__message">
      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -small"></div>
        <div class="chat-skeleton__message-msg -line2 -large"></div>
      </div>
    </div>

    <div class="chat-skeleton__message">
      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -medium"></div>
        <div class="chat-skeleton__message-msg -line2 -large"></div>
      </div>
    </div>

    <div class="chat-skeleton__message">
      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -large"></div>
        <div class="chat-skeleton__message-msg -line2 -small"></div>
      </div>
    </div>

    <div class="chat-skeleton__message">
      <div class="chat-skeleton__message-avatar"></div>
      <div class="chat-skeleton__message-poster"></div>
      <div class="chat-skeleton__message-content">
        <div class="chat-skeleton__message-msg -line1 -medium"></div>
        <div class="chat-skeleton__message-msg -line2 -large"></div>
      </div>
    </div>
  </div>
</div>