anchor.diff:      <head>
           <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
           <meta name="viewport" content="width=device-width" />
  +        <meta name="color-scheme" content="light dark">
  +        <meta name="supported-color-schemes" content="light dark">
           <style>
  -            iframe {
  -                display: none!important;
  -            }
               * {
                   margin: 0;
                   padding: 0;
               }
               * {
  -                font-family: Helvetica, Arial, sans-serif;
  +                font-family: -apple-system, system-ui, Helvetica, Arial, sans-serif;
               }
               img {
                   text-decoration:none;
  
positive.code:                 display: block;
                  border: 0;
              }
              .collapse {
                  margin: 0;
                  padding: 0;
              }
              body {
                  -webkit-font-smoothing: antialiased;
                  min-width: 100%;
                  -webkit-text-size-adjust:100%;
                  -ms-text-size-adjust:100%;
                  margin:0;
                  padding:0;
                  color: #353739;
                  font-size: 17px;
              }
              blockquote {
                  padding: 0 0 0 15px;
                  border-left: 2px solid #DCDEE0;
                  color: #7a7c7e;
              }
              a {
                  color: #0867E2;
  
negative.code:                 white-space: pre-wrap;
                  font-family: monospace;
                  font-size: 16px;
                  margin-bottom: 16px;
              }
              iframe {
                  display: none !important;
              }
              .container {
                  display: block !important;
                  max-width: 600px !important;
                  margin: 0 auto !important;
                  clear:both !important;
              }
              .content {
                  padding: 16px;
                  max-width: 600px;
                  margin: 0 auto;
                  display: block;
              }
              .smaller {
                  font-size: 16px;
                  color: #707680;
              }
              @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>
          <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>
  