diff --git a/src/pyj/widgets.pyj b/src/pyj/widgets.pyj
index ff0b74fd90..2df100ac26 100644
--- a/src/pyj/widgets.pyj
+++ b/src/pyj/widgets.pyj
@@ -201,8 +201,8 @@ def scroll_tree_item_into_view(item):
 add_extra_css(def():
     ans = 'a, button:focus { outline: none }; a, button::-moz-focus-inner { border: 0 }\n'
     ans += '.simple-link { cursor: pointer } .simple-link:hover { color: red } .simple-link:active { transform: scale(1.5) }\n'
-    ans += create_button.style
-    ans += create_spinner.style
-    ans += Breadcrumbs.STYLE_RULES
+    ans += create_button.style + '\n'
+    ans += create_spinner.style + '\n'
+    ans += Breadcrumbs.STYLE_RULES + '\n'
     return ans
 )