diff --git a/cms/envs/common.py b/cms/envs/common.py
index 5d19e4d538..ddf9fe9801 100644
--- a/cms/envs/common.py
+++ b/cms/envs/common.py
@@ -465,36 +465,12 @@ PIPELINE_CSS = {
         ],
         'output_filename': 'css/cms-style-app.css',
     },
-    'style-app-extend1': {
-        'source_filenames': [
-            'sass/style-app-extend1.css',
-        ],
-        'output_filename': 'css/cms-style-app-extend1.css',
-    },
     'style-app-rtl': {
         'source_filenames': [
             'sass/style-app-rtl.css',
         ],
         'output_filename': 'css/cms-style-app-rtl.css',
     },
-    'style-app-extend1-rtl': {
-        'source_filenames': [
-            'sass/style-app-extend1-rtl.css',
-        ],
-        'output_filename': 'css/cms-style-app-extend1-rtl.css',
-    },
-    'style-xmodule': {
-        'source_filenames': [
-            'sass/style-xmodule.css',
-        ],
-        'output_filename': 'css/cms-style-xmodule.css',
-    },
-    'style-xmodule-rtl': {
-        'source_filenames': [
-            'sass/style-xmodule-rtl.css',
-        ],
-        'output_filename': 'css/cms-style-xmodule-rtl.css',
-    },
     'style-xmodule-annotations': {
         'source_filenames': [
             'css/vendor/ova/annotator.css',
diff --git a/cms/static/sass/style-app-extend1-rtl.scss b/cms/static/sass/style-app-extend1-rtl.scss
deleted file mode 100644
index 542483e4b5..0000000000
--- a/cms/static/sass/style-app-extend1-rtl.scss
+++ /dev/null
@@ -1,78 +0,0 @@
-// studio - css architecture
-// ====================
-
-// Table of Contents 
-// * +Libs and Resets
-// * +Vendor and Rebase 
-// * +Base - Utilities
-// * +Base - Assets
-// * +Base - Starter
-// * +Base - Elements
-// * +Base - Specific Views
-// * +Base - Contexts
-
-
-// +Libs and Resets - *do not edit*
-// ==================== 
-@import 'bourbon/bourbon'; // lib - bourbon
-@import 'vendor/bi-app/bi-app-rtl'; // set the layout for right to left languages
-
-// +Vendor and Rebase - *referenced/used vendor presentation and reset*
-// ==================== 
-@import 'reset';
-
-// +Base - Utilities
-// ==================== 
-@import 'variables';
-@import 'mixins';
-@import 'mixins-inherited';
-
-// +Base - Assets
-// ==================== 
-@import 'assets/fonts';
-@import 'assets/graphics'; // sprites, basic image/figure/svg styling
-@import 'assets/anims'; // animations
-
-// +Base - Starter
-// ==================== 
-@import 'base';
-
-// +Base - Elements
-// ==================== 
-@import 'elements/typography';
-@import 'elements/pagination'; // pagination
-@import 'elements/icons'; // references to icons used
-@import 'elements/controls'; // buttons, link styles, sliders, etc.
-@import 'elements/xblocks'; //  studio rendering chrome for xblocks
-@import 'elements/modules'; //  content module patterns
-@import 'elements/layout'; // various standard layouts
-@import 'elements/uploaded-assets'; // layout for asset tables
-
-// +Base - Specific Views
-// ==================== 
-@import 'views/account';
-@import 'views/assets';
-@import 'views/updates';
-@import 'views/dashboard';
-@import 'views/export';
-@import 'views/index';
-@import 'views/course-create';
-@import 'views/import';
-@import 'views/outline';
-@import 'views/settings';
-@import 'views/static-pages';
-@import 'views/unit';
-@import 'views/container';
-@import 'views/users';
-@import 'views/checklists';
-@import 'views/textbooks';
-@import 'views/export-git';
-@import 'views/group-configuration';
-@import 'views/video-upload';
-
-// +Base - Contexts
-// ==================== 
-@import 'contexts/ie'; // ie-specific rules (mostly for known/older bugs)
-
-@import 'developer'; // used for any developer-created scss that needs further polish/refactoring
-@import 'shame';     // used for any bad-form/orphaned scss
diff --git a/cms/static/sass/style-app-extend1.scss b/cms/static/sass/style-app-extend1.scss
deleted file mode 100644
index 13efe1702d..0000000000
--- a/cms/static/sass/style-app-extend1.scss
+++ /dev/null
@@ -1,78 +0,0 @@
-// studio - css architecture
-// ====================
-
-// Table of Contents 
-// * +Libs and Resets
-// * +Vendor and Rebase 
-// * +Base - Utilities
-// * +Base - Assets
-// * +Base - Starter
-// * +Base - Elements
-// * +Base - Specific Views
-// * +Base - Contexts
-
-
-// +Libs and Resets - *do not edit*
-// ==================== 
-@import 'bourbon/bourbon'; // lib - bourbon
-@import 'vendor/bi-app/bi-app-ltr'; // set the layout for left to right languages
-
-// +Vendor and Rebase - *referenced/used vendor presentation and reset*
-// ==================== 
-@import 'reset';
-
-// +Base - Utilities
-// ==================== 
-@import 'variables';
-@import 'mixins';
-@import 'mixins-inherited';
-
-// +Base - Assets
-// ==================== 
-@import 'assets/fonts';
-@import 'assets/graphics'; // sprites, basic image/figure/svg styling
-@import 'assets/anims'; // animations
-
-// +Base - Starter
-// ==================== 
-@import 'base';
-
-// +Base - Elements
-// ==================== 
-@import 'elements/typography';
-@import 'elements/pagination'; // pagination
-@import 'elements/icons'; // references to icons used
-@import 'elements/controls'; // buttons, link styles, sliders, etc.
-@import 'elements/xblocks'; //  studio rendering chrome for xblocks
-@import 'elements/modules'; //  content module patterns
-@import 'elements/layout'; // various standard layouts
-@import 'elements/uploaded-assets'; // layout for asset tables
-
-// +Base - Specific Views
-// ==================== 
-@import 'views/account';
-@import 'views/assets';
-@import 'views/updates';
-@import 'views/dashboard';
-@import 'views/export';
-@import 'views/index';
-@import 'views/course-create';
-@import 'views/import';
-@import 'views/outline';
-@import 'views/settings';
-@import 'views/static-pages';
-@import 'views/unit';
-@import 'views/container';
-@import 'views/users';
-@import 'views/checklists';
-@import 'views/textbooks';
-@import 'views/export-git';
-@import 'views/group-configuration';
-@import 'views/video-upload';
-
-// +Base - Contexts
-// ==================== 
-@import 'contexts/ie'; // ie-specific rules (mostly for known/older bugs)
-
-@import 'developer'; // used for any developer-created scss that needs further polish/refactoring
-@import 'shame';     // used for any bad-form/orphaned scss
diff --git a/cms/static/sass/style-app-rtl.scss b/cms/static/sass/style-app-rtl.scss
index ff9b6814cf..7dddaa7f3c 100644
--- a/cms/static/sass/style-app-rtl.scss
+++ b/cms/static/sass/style-app-rtl.scss
@@ -1,44 +1,49 @@
 // studio - css architecture
 // ====================
 
-// Table of Contents 
+// Table of Contents
 // * +Libs and Resets
-// * +Vendor and Rebase 
+// * +Vendor and Rebase
 // * +Base - Utilities
 // * +Base - Assets
 // * +Base - Starter
 // * +Base - Elements
+// * +Base - Specific Views
+// * +Base - Contexts
+// * +Xmodule
 
 // +Libs and Resets - *do not edit*
-// ==================== 
+// ====================
 @import 'bourbon/bourbon'; // lib - bourbon
 @import 'vendor/bi-app/bi-app-rtl'; // set the layout for right to left languages
 
 // +Vendor and Rebase - *referenced/used vendor presentation and reset*
-// ==================== 
+// ====================
 @import 'reset';
 
 // +Base - Utilities
-// ==================== 
+// ====================
 @import 'variables';
 @import 'mixins';
 @import 'mixins-inherited';
 
 // +Base - Assets
-// ==================== 
+// ====================
 @import 'assets/fonts';
 @import 'assets/graphics'; // sprites, basic image/figure/svg styling
 @import 'assets/anims'; // animations
 
 // +Base - Starter
-// ==================== 
+// ====================
 @import 'base';
 
 // +Base - Elements
-// ==================== 
+// ====================
 @import 'elements/typography';
 @import 'elements/icons'; // references to icons used
 @import 'elements/controls'; // buttons, link styles, sliders, etc.
+@import 'elements/pagination'; // pagination
+@import 'elements/xblocks'; //  studio rendering chrome for xblocks
 @import 'elements/modules'; //  content module patterns
 @import 'elements/navigation'; // all archetypes of navigation
 @import 'elements/layout'; // various standard layouts
@@ -52,3 +57,40 @@
 @import 'elements/modal'; // interstitial UI, dialogs, modal windows
 @import 'elements/vendor'; // overrides to vendor-provided styling
 @import 'elements/modal-window';
+@import 'elements/uploaded-assets'; // layout for asset tables
+
+// +Base - Specific Views
+// ====================
+@import 'views/account';
+@import 'views/assets';
+@import 'views/updates';
+@import 'views/dashboard';
+@import 'views/export';
+@import 'views/index';
+@import 'views/course-create';
+@import 'views/import';
+@import 'views/outline';
+@import 'views/settings';
+@import 'views/static-pages';
+@import 'views/unit';
+@import 'views/container';
+@import 'views/users';
+@import 'views/checklists';
+@import 'views/textbooks';
+@import 'views/export-git';
+@import 'views/group-configuration';
+@import 'views/video-upload';
+
+// +Base - Contexts
+// ====================
+@import 'contexts/ie'; // ie-specific rules (mostly for known/older bugs)
+
+// +Xmodule
+// ====================
+@import 'xmodule/modules/css/module-styles.scss';
+@import 'xmodule/descriptors/css/module-styles.scss';
+@import 'elements/xmodules'; // styling for Studio-specific contexts
+
+@import 'developer'; // used for any developer-created scss that needs further polish/refactoring
+@import 'shame';     // used for any bad-form/orphaned scss
+
diff --git a/cms/static/sass/style-app.scss b/cms/static/sass/style-app.scss
index 3bca8305ff..169c3762b5 100644
--- a/cms/static/sass/style-app.scss
+++ b/cms/static/sass/style-app.scss
@@ -1,44 +1,49 @@
 // studio - css architecture
 // ====================
 
-// Table of Contents 
+// Table of Contents
 // * +Libs and Resets
-// * +Vendor and Rebase 
+// * +Vendor and Rebase
 // * +Base - Utilities
 // * +Base - Assets
 // * +Base - Starter
 // * +Base - Elements
+// * +Base - Specific Views
+// * +Base - Contexts
+// * +Xmodule
 
 // +Libs and Resets - *do not edit*
-// ==================== 
+// ====================
 @import 'bourbon/bourbon'; // lib - bourbon
 @import 'vendor/bi-app/bi-app-ltr'; // set the layout for left to right languages
 
 // +Vendor and Rebase - *referenced/used vendor presentation and reset*
-// ==================== 
+// ====================
 @import 'reset';
 
 // +Base - Utilities
-// ==================== 
+// ====================
 @import 'variables';
 @import 'mixins';
 @import 'mixins-inherited';
 
 // +Base - Assets
-// ==================== 
+// ====================
 @import 'assets/fonts';
 @import 'assets/graphics'; // sprites, basic image/figure/svg styling
 @import 'assets/anims'; // animations
 
 // +Base - Starter
-// ==================== 
+// ====================
 @import 'base';
 
 // +Base - Elements
-// ==================== 
+// ====================
 @import 'elements/typography';
 @import 'elements/icons'; // references to icons used
 @import 'elements/controls'; // buttons, link styles, sliders, etc.
+@import 'elements/pagination'; // pagination
+@import 'elements/xblocks'; //  studio rendering chrome for xblocks
 @import 'elements/modules'; //  content module patterns
 @import 'elements/navigation'; // all archetypes of navigation
 @import 'elements/layout'; // various standard layouts
@@ -52,3 +57,39 @@
 @import 'elements/modal'; // interstitial UI, dialogs, modal windows
 @import 'elements/vendor'; // overrides to vendor-provided styling
 @import 'elements/modal-window';
+@import 'elements/uploaded-assets'; // layout for asset tables
+
+// +Base - Specific Views
+// ====================
+@import 'views/account';
+@import 'views/assets';
+@import 'views/updates';
+@import 'views/dashboard';
+@import 'views/export';
+@import 'views/index';
+@import 'views/course-create';
+@import 'views/import';
+@import 'views/outline';
+@import 'views/settings';
+@import 'views/static-pages';
+@import 'views/unit';
+@import 'views/container';
+@import 'views/users';
+@import 'views/checklists';
+@import 'views/textbooks';
+@import 'views/export-git';
+@import 'views/group-configuration';
+@import 'views/video-upload';
+
+// +Base - Contexts
+// ====================
+@import 'contexts/ie'; // ie-specific rules (mostly for known/older bugs)
+
+// +Xmodule
+// ====================
+@import 'xmodule/modules/css/module-styles.scss';
+@import 'xmodule/descriptors/css/module-styles.scss';
+@import 'elements/xmodules'; // styling for Studio-specific contexts
+
+@import 'developer'; // used for any developer-created scss that needs further polish/refactoring
+@import 'shame';     // used for any bad-form/orphaned scss
diff --git a/cms/static/sass/style-xmodule-rtl.scss b/cms/static/sass/style-xmodule-rtl.scss
deleted file mode 100644
index f5e3379acc..0000000000
--- a/cms/static/sass/style-xmodule-rtl.scss
+++ /dev/null
@@ -1,50 +0,0 @@
-// studio - xmodule architecture
-// ====================
-
-// Table of Contents 
-// * +Libs and Resets
-// * +Vendor and Rebase 
-// * +Base - Utilities
-// * +Base - Assets
-// * +Base - Starter
-// * +Base - Elements
-// * +Xmodule
-
-
-// +Libs and Resets - *do not edit*
-// ==================== 
-@import 'bourbon/bourbon'; // lib - bourbon
-@import 'vendor/bi-app/bi-app-rtl'; // set the layout for right to left languages
-
-// +Vendor and Rebase - *referenced/used vendor presentation and reset*
-// ==================== 
-@import 'reset';
-
-// +Base - Utilities
-// ==================== 
-@import 'variables';
-@import 'mixins';
-@import 'mixins-inherited';
-
-// +Base - Assets
-// ==================== 
-@import 'assets/fonts';
-@import 'assets/graphics'; // sprites, basic image/figure/svg styling
-@import 'assets/anims'; // animations
-
-// +Base - Starter
-// ==================== 
-@import 'base';
-
-// +Base - Elements
-// ==================== 
-@import 'elements/typography';
-@import 'elements/icons'; // references to icons used
-@import 'elements/controls'; // buttons, link styles, sliders, etc.
-@import 'elements/navigation'; // all archetypes of navigation
-
-// +Xmodule
-// ==================== 
-@import 'xmodule/modules/css/module-styles.scss';
-@import 'xmodule/descriptors/css/module-styles.scss';
-@import 'elements/xmodules'; // styling for Studio-specific contexts
diff --git a/cms/static/sass/style-xmodule.scss b/cms/static/sass/style-xmodule.scss
deleted file mode 100644
index d083a749a6..0000000000
--- a/cms/static/sass/style-xmodule.scss
+++ /dev/null
@@ -1,49 +0,0 @@
-// studio - xmodule architecture
-// ====================
-
-// Table of Contents 
-// * +Libs and Resets
-// * +Vendor and Rebase 
-// * +Base - Utilities
-// * +Base - Assets
-// * +Base - Starter
-// * +Base - Elements
-// * +Xmodule
-
-// +Libs and Resets - *do not edit*
-// ==================== 
-@import 'bourbon/bourbon'; // lib - bourbon
-@import 'vendor/bi-app/bi-app-ltr'; // set the layout for left to right languages
-
-// +Vendor and Rebase - *referenced/used vendor presentation and reset*
-// ==================== 
-@import 'reset';
-
-// +Base - Utilities
-// ==================== 
-@import 'variables';
-@import 'mixins';
-@import 'mixins-inherited';
-
-// +Base - Assets
-// ==================== 
-@import 'assets/fonts';
-@import 'assets/graphics'; // sprites, basic image/figure/svg styling
-@import 'assets/anims'; // animations
-
-// +Base - Starter
-// ==================== 
-@import 'base';
-
-// +Base - Elements
-// ==================== 
-@import 'elements/typography';
-@import 'elements/icons'; // references to icons used
-@import 'elements/controls'; // buttons, link styles, sliders, etc.
-@import 'elements/navigation'; // all archetypes of navigation
-
-// +Xmodule
-// ==================== 
-@import 'xmodule/modules/css/module-styles.scss';
-@import 'xmodule/descriptors/css/module-styles.scss';
-@import 'elements/xmodules'; // styling for Studio-specific contexts
diff --git a/cms/templates/base.html b/cms/templates/base.html
index 607aa2024c..049450ca09 100644
--- a/cms/templates/base.html
+++ b/cms/templates/base.html
@@ -37,8 +37,6 @@ import json
     <%static:css group='style-vendor-tinymce-content'/>
     <%static:css group='style-vendor-tinymce-skin'/>
     <%static:css group='style-app'/>
-    <%static:css group='style-app-extend1'/>
-    <%static:css group='style-xmodule'/>
 
     <%include file="widgets/segment-io.html" />