diff --git a/common/gtk-3.0/3.20/gtk-dark.css b/common/gtk-3.0/3.20/gtk-dark.css
index 5bb2f12..7771f67 100644
--- a/common/gtk-3.0/3.20/gtk-dark.css
+++ b/common/gtk-3.0/3.20/gtk-dark.css
@@ -3393,6 +3393,10 @@ button.documents-favorite:active:hover {
   opacity: 0.0;
   transition: opacity 0.2s ease-out; }
 
+.tweak-categories,
+.tweak-category:not(:selected):not(:hover) {
+  background-image: linear-gradient(to bottom, #404552, #404552); }
+
 .tr-workarea undershoot,
 .tr-workarea overshoot {
   border-color: transparent; }
diff --git a/common/gtk-3.0/3.20/gtk-darker.css b/common/gtk-3.0/3.20/gtk-darker.css
index ad1f2c9..0ec8f61 100644
--- a/common/gtk-3.0/3.20/gtk-darker.css
+++ b/common/gtk-3.0/3.20/gtk-darker.css
@@ -3392,6 +3392,10 @@ button.documents-favorite:active:hover {
   opacity: 0.0;
   transition: opacity 0.2s ease-out; }
 
+.tweak-categories,
+.tweak-category:not(:selected):not(:hover) {
+  background-image: linear-gradient(to bottom, #ffffff, #ffffff); }
+
 .tr-workarea undershoot,
 .tr-workarea overshoot {
   border-color: transparent; }
diff --git a/common/gtk-3.0/3.20/gtk-solid-dark.css b/common/gtk-3.0/3.20/gtk-solid-dark.css
index bbe5c00..8db8e7a 100644
--- a/common/gtk-3.0/3.20/gtk-solid-dark.css
+++ b/common/gtk-3.0/3.20/gtk-solid-dark.css
@@ -3393,6 +3393,10 @@ button.documents-favorite:active:hover {
   opacity: 0.0;
   transition: opacity 0.2s ease-out; }
 
+.tweak-categories,
+.tweak-category:not(:selected):not(:hover) {
+  background-image: linear-gradient(to bottom, #404552, #404552); }
+
 .tr-workarea undershoot,
 .tr-workarea overshoot {
   border-color: transparent; }
diff --git a/common/gtk-3.0/3.20/gtk-solid-darker.css b/common/gtk-3.0/3.20/gtk-solid-darker.css
index bcfd6d4..cce0db2 100644
--- a/common/gtk-3.0/3.20/gtk-solid-darker.css
+++ b/common/gtk-3.0/3.20/gtk-solid-darker.css
@@ -3392,6 +3392,10 @@ button.documents-favorite:active:hover {
   opacity: 0.0;
   transition: opacity 0.2s ease-out; }
 
+.tweak-categories,
+.tweak-category:not(:selected):not(:hover) {
+  background-image: linear-gradient(to bottom, #ffffff, #ffffff); }
+
 .tr-workarea undershoot,
 .tr-workarea overshoot {
   border-color: transparent; }
diff --git a/common/gtk-3.0/3.20/gtk-solid.css b/common/gtk-3.0/3.20/gtk-solid.css
index 6153a58..4fa2733 100644
--- a/common/gtk-3.0/3.20/gtk-solid.css
+++ b/common/gtk-3.0/3.20/gtk-solid.css
@@ -3396,6 +3396,10 @@ button.documents-favorite:active:hover {
   opacity: 0.0;
   transition: opacity 0.2s ease-out; }
 
+.tweak-categories,
+.tweak-category:not(:selected):not(:hover) {
+  background-image: linear-gradient(to bottom, #ffffff, #ffffff); }
+
 .tr-workarea undershoot,
 .tr-workarea overshoot {
   border-color: transparent; }
diff --git a/common/gtk-3.0/3.20/gtk.css b/common/gtk-3.0/3.20/gtk.css
index 40bd3e3..9242e81 100644
--- a/common/gtk-3.0/3.20/gtk.css
+++ b/common/gtk-3.0/3.20/gtk.css
@@ -3396,6 +3396,10 @@ button.documents-favorite:active:hover {
   opacity: 0.0;
   transition: opacity 0.2s ease-out; }
 
+.tweak-categories,
+.tweak-category:not(:selected):not(:hover) {
+  background-image: linear-gradient(to bottom, #ffffff, #ffffff); }
+
 .tr-workarea undershoot,
 .tr-workarea overshoot {
   border-color: transparent; }
diff --git a/common/gtk-3.0/3.20/sass/_applications.scss b/common/gtk-3.0/3.20/sass/_applications.scss
index 7f1012d..9697e9d 100644
--- a/common/gtk-3.0/3.20/sass/_applications.scss
+++ b/common/gtk-3.0/3.20/sass/_applications.scss
@@ -501,6 +501,14 @@ button.documents-favorite:active:hover {
     transition: opacity 0.2s ease-out;
 }
 
+//
+// Gnome Tweak Tool
+//
+.tweak-categories,
+.tweak-category:not(:selected):not(:hover) {
+  background-image: _solid($base_color);
+}
+
 //
 // Transmission
 //