Index: app/views/account/login.html.erb
===================================================================
--- app/views/account/login.html.erb	(revision 15819)
+++ app/views/account/login.html.erb	(working copy)
@@ -22,7 +22,7 @@
     <label for="autologin"><%= check_box_tag 'autologin', 1, false, :tabindex => 4 %> <%= l(:label_stay_logged_in) %></label>
   <% end %>
   
-  <input type="submit" name="login" value="<%=l(:button_login)%>" tabindex="5" id="login-submit" />
+  <button type="submit" name="login" tabindex="5" id="login-submit"><%=l(:button_login)%></button>
   <% end %>
 </div>
 
Index: public/stylesheets/application.css
===================================================================
--- public/stylesheets/application.css	(revision 15819)
+++ public/stylesheets/application.css	(working copy)
@@ -123,7 +123,7 @@
 #login-form label[for=autologin] {font-weight:normal;}
 #login-form a.lost_password {float:right; font-weight:normal;}
 #login-form input#openid_url {background:#fff url(../images/openid-bg.gif) no-repeat 4px 50%; padding-left:24px !important;}
-#login-form input#login-submit {margin-top:15px; padding:7px; display:block; width:100%; box-sizing: border-box;}
+#login-form button#login-submit {margin-top:15px; padding:7px; display:block; width:100%; box-sizing: border-box;}
 
 div.modal { border-radius:5px; background:#fff; z-index:50; padding:4px;}
 div.modal h3.title {display:none;}