diff --git a/packages/default-theme/package.json b/packages/default-theme/package.json
index ac94bcf5b..bab0c28cf 100644
--- a/packages/default-theme/package.json
+++ b/packages/default-theme/package.json
@@ -19,7 +19,8 @@
     "src/*",
     "types/*",
     "images/*.png",
-    "style/*.css"
+    "style/*.css",
+    "style/index.js"
   ],
   "style": "style/index.css",
   "repository": {
diff --git a/packages/default-theme/style/index.js b/packages/default-theme/style/index.js
new file mode 100644
index 000000000..cb86162dd
--- /dev/null
+++ b/packages/default-theme/style/index.js
@@ -0,0 +1,16 @@
+/*-----------------------------------------------------------------------------
+| Copyright (c) 2014-2018, PhosphorJS Contributors
+|
+| Distributed under the terms of the BSD 3-Clause License.
+|
+| The full license is in the file LICENSE, distributed with this software.
+|----------------------------------------------------------------------------*/
+import '@lumino/dragdrop/style/index';
+import '@lumino/widgets/style/index';
+import './commandpalette.css';
+import './datagrid.css';
+import './dockpanel.css';
+import './menu.css';
+import './menubar.css';
+import './scrollbar.css';
+import './tabbar.css';
diff --git a/packages/dragdrop/package.json b/packages/dragdrop/package.json
index fc1a4b26e..092737d5e 100644
--- a/packages/dragdrop/package.json
+++ b/packages/dragdrop/package.json
@@ -22,7 +22,8 @@
     "dist/*",
     "src/*",
     "types/*",
-    "style/*.css"
+    "style/*.css",
+    "style/index.js"
   ],
   "main": "dist/index.js",
   "unpkg": "dist/index.min.js",
diff --git a/packages/dragdrop/style/index.js b/packages/dragdrop/style/index.js
new file mode 100644
index 000000000..a171ec0ad
--- /dev/null
+++ b/packages/dragdrop/style/index.js
@@ -0,0 +1,10 @@
+/*-----------------------------------------------------------------------------
+| Copyright (c) Jupyter Development Team.
+| Copyright (c) 2014-2017, PhosphorJS Contributors
+|
+| Distributed under the terms of the BSD 3-Clause License.
+|
+| The full license is in the file LICENSE, distributed with this software.
+|----------------------------------------------------------------------------*/
+
+import './index.css';
diff --git a/packages/widgets/package.json b/packages/widgets/package.json
index b1bdf0e98..d17a29523 100644
--- a/packages/widgets/package.json
+++ b/packages/widgets/package.json
@@ -22,7 +22,8 @@
     "dist/*",
     "src/*",
     "types/*",
-    "style/*.css"
+    "style/*.css",
+    "style/index.js"
   ],
   "main": "dist/index.js",
   "unpkg": "dist/index.min.js",
diff --git a/packages/widgets/style/index.js b/packages/widgets/style/index.js
new file mode 100644
index 000000000..a171ec0ad
--- /dev/null
+++ b/packages/widgets/style/index.js
@@ -0,0 +1,10 @@
+/*-----------------------------------------------------------------------------
+| Copyright (c) Jupyter Development Team.
+| Copyright (c) 2014-2017, PhosphorJS Contributors
+|
+| Distributed under the terms of the BSD 3-Clause License.
+|
+| The full license is in the file LICENSE, distributed with this software.
+|----------------------------------------------------------------------------*/
+
+import './index.css';