More less refactoring.

src/application/index.less

@@ -0,0 +1,48 @@
+/*-----------------------------------------------------------------------------
+| Copyright (c) Jupyter Development Team.
+| Distributed under the terms of the Modified BSD License.
+|----------------------------------------------------------------------------*/
+
+
+@import url('~phosphor/styles/base.css');
+
+
+/*-----------------------------------------------------------------------------
+| General
+|----------------------------------------------------------------------------*/
+
+
+body {
+  margin: 0;
+  padding: 0;
+  background: #E0E0E0;
+  overflow: hidden;
+  font-family: sans-serif;
+}
+
+
+.jp-ApplicationShell {
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+}
+
+
+.p-mod-hidden {
+  display: none !important;
+}
+
+
+/*-----------------------------------------------------------------------------
+| Import children style files
+|----------------------------------------------------------------------------*/
+
+
+@import './dockpanel.less';
+@import './menus.less';
+@import './sidepanel.less';
+@import './tabs.less';
+
+

src/basestyle/sidepanel.less → src/application/sidepanel.less

@@ -95,4 +95,4 @@
 
 #jp-left-stack {
   border-right: 1px solid #BDBDBD;
-}
+}

src/basestyle/index.less

@@ -1,14 +0,0 @@
-/*-----------------------------------------------------------------------------
-| Copyright (c) Jupyter Development Team.
-| Distributed under the terms of the Modified BSD License.
-|----------------------------------------------------------------------------*/
-
-
-@import url('~phosphor/styles/base.css');
-
-// Overall application
-@import './application.less';
-@import './menus.less';
-@import './tabs.less';
-@import './sidepanel.less';
-@import './dockpanel.less';

src/default-theme/index.less

@@ -8,10 +8,13 @@
 @import './variables.less';
 
 // Base styles
-@import '../basestyle/index.css'
+@import '../basestyle/materialcolors.css'
 
-// Specific plugins
-@import './about.less';
+// Main application (1st)
+@import './application/index.less';
+
+// Individual plugins
+@import './about/index.less';
 @import './codemirror.less';
 @import './commandpalette.less';
 @import './completion.less';