anchor.diff:        font-family: Helvetica;
         background-color: #e1e1e1;
         width: 240px;
  -      margin: 6px 15px;
  +      margin: 15px 15px;
         font-size: 20px;
       }
       label {
  -      padding: 5px 15px;
  +      padding: 10px 15px;
         display: block;
         font-size: 15px;
       }
  
positive.code: </head>
  
  <body>
    <header><%= t :login, "Login" %></header>
    <div id="f1_container">
      <div id="f1_card">
        <% form_for :pseudonym_session, :url => login_path, :html => {:id => "login_form", :class => "front face"} do |f| %>
  
negative.code:       width: 100%;
        height: 100%;
        -webkit-backface-visibility: hidden;
        padding: 0;
      }
      .face.back {
        display: block;
  