diff --git a/_share/media/sass/missing-semester.sass b/_share/media/sass/missing-semester.sass
index 2c92aa7..50fdd9e 100644
--- a/_share/media/sass/missing-semester.sass
+++ b/_share/media/sass/missing-semester.sass
@@ -3,13 +3,10 @@
 
 @use 'default-org-mode'
 
-@use 'variables' as * 
+@use 'themes/desert-oasis' as * 
 @use 'fonts' as fonts
 @use 'mixins' as mixins-basic
 
-@use 'collapsible'
-
-
 @include mixins-basic.set-header-sizes($default-header-sizes)
 @include mixins-basic.set-header-colors($default-header-colors)
 @include mixins-basic.set-header-margins-sides($default-header-margins-sides)
diff --git a/_share/media/sass/_variables.sass b/_share/media/sass/themes/desert-oasis.sass
similarity index 98%
rename from _share/media/sass/_variables.sass
rename to _share/media/sass/themes/desert-oasis.sass
index ea1fa24..258f4d9 100644
--- a/_share/media/sass/_variables.sass
+++ b/_share/media/sass/themes/desert-oasis.sass
@@ -1,6 +1,8 @@
+// themes/desert-oasis.sass
+
 @use "sass:map"
 @use "sass:color"
-@use 'fonts' as fonts
+@use '../fonts' as fonts
 
 $list-padding-left: 1.5em
 
diff --git a/_subsections/lesson-02.org b/_subsections/lesson-02.org
index a8d1f4d..9c48bfe 100644
--- a/_subsections/lesson-02.org
+++ b/_subsections/lesson-02.org
@@ -1,5 +1,6 @@
 #+title: lesson 02 | course overview + the shell
 #+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../_share/media/css/missing-semester.css" />
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="_share/media/css/collapsible.css" />
 #+HTML_HEAD: <script src="../_share/media/js/collapsible.js"></script>
 
 * Links
diff --git a/_subsections/lesson-03.org b/_subsections/lesson-03.org
index 015c16b..c41f27f 100644
--- a/_subsections/lesson-03.org
+++ b/_subsections/lesson-03.org
@@ -1,5 +1,6 @@
 #+title: Lesson 02 | shell tools and scripting
 #+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../_share/media/css/missing-semester.css" />
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="_share/media/css/collapsible.css" />
 #+HTML_HEAD: <script src="../_share/media/js/collapsible.js"></script>
 
 * Links
diff --git a/toc.org b/toc.org
index 3e2b322..b1a5f5b 100644
--- a/toc.org
+++ b/toc.org
@@ -1,6 +1,7 @@
 #+title: Missing Semester IAP 2020
 #+HTML_HEAD: <link rel="stylesheet" type="text/css" href="_share/media/css/missing-semester.css" />
 #+HTML_HEAD: <link rel="stylesheet" type="text/css" href="_share/media/css/content-overview.css" />
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="_share/media/css/collapsible.css" />
 #+HTML_HEAD: <script src="_share/media/js/collapsible.js"></script>
 
 * Links