anchor.diff:  <!--   Begin new topic  -->
       <tr style="vertical-align:top;">
         <td style="padding:20px 8px 0 16px;text-align:left;">
  -        <p style="background:#2F70AC;border-radius:50%;color:#fff;height:30px;line-height:30px;margin:0 0 10px 0;padding:0;text-align:center;width:30px;font-weight: 400;">
  +        <p style="background:#2F70AC;border-radius:50%;color:#fff;height:30px;line-height:30px;margin:0 0 10px 0;padding:0;text-align:center;width:30px;">
             <%= t.user_data ? (t.highest_post_number - (t.user_data.last_read_post_number || 0)) : t.highest_post_number %>
           </p>
         </td>
  
positive.code: <table style="background-color: #f3f3f3; width: 100%;">
    <tr>
      <td>
        <h1 style="color:#0a0a0a;font-size:28px;font-weight:400;line-height:1.3; padding: 30px 0 10px 0;text-align:center;">
          <%=t 'user_notifications.digest.popular_posts' %>
        </h1>
      </td>
  
negative.code: <table style="width:100%">
    <tbody>
      <tr>
        <td style="margin:0;padding:0 0 0 16px;text-align:left;vertical-align:top;">
          <p style="color:#8f8f8f;line-height:1.3;margin: 20px 0 0 0;">
            <%= category_badge(t.category, inline_style: true, absolute_url: true) %>
          </p>
        </td>
        <td style="margin:0;padding: 0 16px 0 0;text-align:right;vertical-align:top;">
          <p class="text-right" style="color:#8f8f8f;line-height:1.3;margin:20px 0 0 0;font-weight:400;">
            <%= short_date(t.created_at) %>
          </p>
        </td>
  