anchor.diff:                  white-space: pre-wrap;
                   font-family: monospace;
                   font-size: 16px;
  -                margin-bottom: 10px;
  +                margin-bottom: 16px;
  +            }
  +            iframe {
  +                display: none !important;
               }
               .container {
  -                display: block!important;
  -                max-width: 600px!important;
  -                margin: 0 auto!important;/* makes it centered */
  -                clear:both!important;
  +                display: block !important;
  +                max-width: 600px !important;
  +                margin: 0 auto !important;
  +                clear:both !important;
               }
               .content {
  -                padding: 15px;
  +                padding: 16px;
                   max-width: 600px;
                   margin: 0 auto;
                   display: block;
               }
  -            .content table {
  -                width: 100%;
  -            }
               .smaller {
                   font-size: 16px;
  -                color: #b4b6b8;
  +                color: #707680;
               }
  -            @media (max-width: 600px) {
  -                table.body-wrap {
  -                    border: none;
  +            @media (prefers-color-scheme: dark) {
  +                body {
  +                    background: #262626 !important;
  +                    color: #D4D4D4 !important;
  +                }
  +                blockquote {
  +                    border-left-color: #353535 !important;
  +                }
  +                hr {
  +                    background: #353535 !important;
  +                }
  +                a {
  +                    color: #FFF !important;
  +                }
  +                .smaller {
  +                    color: #8C8C8C !important;
                   }
               }
           </style>
       </head>
  -    <body bgcolor="#FFFFFF">
  -        <table class="body-wrap" cellspacing="0">
  -            <tr>
  -                <td></td>
  -                <td class="container" bgcolor="#FFFFFF">
  -                    <div class="content">
  -                        <table>
  -                            <tr>
  -                                <td>
  -                                    <% if @message.present? %>
  -                                        <p class="pre"><%= @message %></p>
  -                                        <hr />
  -                                    <% end %>
  -                                    <h1><%= link_to strip_tags(@entry.title), @entry.fully_qualified_url  %></h1>
  -                                    <p class="smaller">
  -                                        <%= strip_tags(@entry.feed.title) %>
  -                                        <br />
  -                                        <%= @entry.published.to_s(:full_human) %>
  -                                    </p>
  -                                    <%= raw(ContentFormatter.api_format(@content, @entry)) %>
  -                                </td>
  -                            </tr>
  -                        </table>
  -                    </div>
  -                </td>
  -                <td></td>
  -            </tr>
  -        </table>
  +    <body>
  +        <div class="container">
  +            <div class="content">
  +                <% if @message.present? %>
  +                    <p class="pre"><%= @message %></p>
  +                    <hr />
  +                <% end %>
  +                <h1><%= link_to strip_tags(@entry.title), @entry.fully_qualified_url  %></h1>
  +                <p class="smaller">
  +                    <%= strip_tags(@entry.feed.title) %>
  +                    <br />
  +                    <%= @entry.published.to_s(:full_human) %>
  +                </p>
  +                <%= raw(ContentFormatter.api_format(@content, @entry)) %>
  +            </div>
  +        </div>
       </body>
   </html>
  
positive.code:     <head>
          <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
          <meta name="viewport" content="width=device-width" />
          <style>
              iframe {
                  display: none!important;
              }
              * {
                  margin: 0;
                  padding: 0;
              }
              * {
                  font-family: Helvetica, Arial, sans-serif;
              }
              img {
                  text-decoration:none;
  
negative.code:                 display: block;
                  border: 0;
              }
              body {
                  -webkit-font-smoothing: antialiased;
                  min-width: 100%;
                  -webkit-text-size-adjust: 100%;
                  -ms-text-size-adjust: 100%;
                  margin: 0;
                  padding: 0;
                  color: #0D1623;
                  font-size: 17px;
              }
              blockquote {
                  padding: 0 0 0 15px;
                  border-left: 2px solid #E9E9EB;
              }
              a {
                  color: #0867E2;
  