diff --git a/app/css/custom.css b/app/css/custom.css
index fb30fc92..1244cd46 100644
--- a/app/css/custom.css
+++ b/app/css/custom.css
@@ -185,13 +185,3 @@ pre.unstyled {
   font-size: 0.9rem!important;
 }
 
-/* change transition animation when sidebar is toggled */
-#accordionSidebar.toggled {
-  -webkit-transition-timing-function: ease;
-       -o-transition-timing-function: ease;
-          transition-timing-function: ease;
-  -webkit-transition-duration: .2s;
-       -o-transition-duration: .2s;
-          transition-duration: .2s;
-}
-
diff --git a/app/css/hackernews.css b/app/css/hackernews.css
index 56663403..5d3ad409 100644
--- a/app/css/hackernews.css
+++ b/app/css/hackernews.css
@@ -198,12 +198,3 @@ pre.unstyled {
   font-size: 0.9rem!important;
 }
 
-/* change transition animation when sidebar is toggled */
-#accordionSidebar.toggled {
-  -webkit-transition-timing-function: ease;
-       -o-transition-timing-function: ease;
-          transition-timing-function: ease;
-  -webkit-transition-duration: .2s;
-       -o-transition-duration: .2s;
-          transition-duration: .2s;
-
diff --git a/app/css/terminal.css b/app/css/terminal.css
index 811882d9..8d062097 100644
--- a/app/css/terminal.css
+++ b/app/css/terminal.css
@@ -368,12 +368,4 @@ pre {
 .toggle-on.btn {
   font-size: 0.9rem!important;
 }
-/* change transition animation when sidebar is toggled */
-#accordionSidebar.toggled {
-  -webkit-transition-timing-function: ease;
-       -o-transition-timing-function: ease;
-          transition-timing-function: ease;
-  -webkit-transition-duration: .2s;
-       -o-transition-duration: .2s;
-          transition-duration: .2s;
-}
+