diff --git a/css/devstyles.css b/css/devstyles.css
index 311a459..d8dc90a 100644
--- a/css/devstyles.css
+++ b/css/devstyles.css
@@ -1577,13 +1577,4 @@
 .path-local-treestudyplan .collapse.show,
 .features-treestudyplan .collapse.show {
     height: auto;
-}
-
-body.path-local-treestudyplan.bootstrap-polyfill,
-.features-treestudyplan.bootstrap-polyfill {
-    /* Contains a number of CSS tweaks only needed if the current theme is nog based on boost with bootstrap */
-}
-body.path-local-treestudyplan.bootstrap-polyfill .collapse.show,
-.features-treestudyplan.bootstrap-polyfill .collapse.show {
-    height: auto;
 }
\ No newline at end of file
diff --git a/scss/bootstraptweaking.scss b/scss/bootstraptweaking.scss
index a90c9ab..41514fa 100644
--- a/scss/bootstraptweaking.scss
+++ b/scss/bootstraptweaking.scss
@@ -9,10 +9,3 @@
 
 }
 
-body.path-local-treestudyplan.bootstrap-polyfill, .features-treestudyplan.bootstrap-polyfill {
-    /* Contains a number of CSS tweaks only needed if the current theme is nog based on boost with bootstrap */
-    .collapse.show {
-        height: auto;
-    }
-
-}
diff --git a/styles.css b/styles.css
index 311a459..d8dc90a 100644
--- a/styles.css
+++ b/styles.css
@@ -1577,13 +1577,4 @@
 .path-local-treestudyplan .collapse.show,
 .features-treestudyplan .collapse.show {
     height: auto;
-}
-
-body.path-local-treestudyplan.bootstrap-polyfill,
-.features-treestudyplan.bootstrap-polyfill {
-    /* Contains a number of CSS tweaks only needed if the current theme is nog based on boost with bootstrap */
-}
-body.path-local-treestudyplan.bootstrap-polyfill .collapse.show,
-.features-treestudyplan.bootstrap-polyfill .collapse.show {
-    height: auto;
 }
\ No newline at end of file