anchor.diff:        <% end -%>
         <br>
       <div class="row">
  -      <div class="col s6">
  +      <div class="col s12">
           <div class="actions">
             <button class="btn waves-effect waves-light" type="submit" name="action" style="width:100%;">
             <%= f.submit "로그인" %>
  
positive.code:         </div>
        </div>
        <% end %>
        <div class="col s6"><%= render "devise/shared/links" %></div>
      </div>
  
      <br><br><br><br><br><br>
      </div>
    </div>
  </div>
  
negative.code: <nav style="background-color:darkslategray;"></nav>
  <div class="container">
    <div class="row">
      <div class="col s12 m6 offset-m3 navopc-endchange" style="margin-bottom: 50px;">
        <h2 class="center-align" style="font-size: 2rem; color:#666;">LOG IN</h2>
  
        <%= form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %>
  