diff --git a/common/gtk-3.0/3.20/gtk-dark.css b/common/gtk-3.0/3.20/gtk-dark.css
index 772ce2d..198b0e6 100644
--- a/common/gtk-3.0/3.20/gtk-dark.css
+++ b/common/gtk-3.0/3.20/gtk-dark.css
@@ -3340,6 +3340,59 @@ button.documents-favorite:active:hover {
 .tr-workarea overshoot {
   border-color: transparent; }
 
+#gf-bubble, #gf-bubble.solid,
+#gf-osd-window,
+#gf-osd-window.solid,
+#gf-input-source-popup,
+#gf-input-source-popup.solid,
+#gf-candidate-popup,
+#gf-candidate-popup.solid {
+  color: #cfd5de;
+  background-color: rgba(53, 57, 69, 0.95);
+  border: 1px solid rgba(35, 38, 46, 0.95);
+  border-radius: 2px; }
+
+#gf-bubble levelbar block.low, #gf-bubble levelbar block.high, #gf-bubble levelbar block.full,
+#gf-osd-window levelbar block.low,
+#gf-osd-window levelbar block.high,
+#gf-osd-window levelbar block.full,
+#gf-input-source-popup levelbar block.low,
+#gf-input-source-popup levelbar block.high,
+#gf-input-source-popup levelbar block.full,
+#gf-candidate-popup levelbar block.low,
+#gf-candidate-popup levelbar block.high,
+#gf-candidate-popup levelbar block.full {
+  background-color: #5294e2;
+  border-color: #5294e2; }
+
+#gf-bubble levelbar block.empty,
+#gf-osd-window levelbar block.empty,
+#gf-input-source-popup levelbar block.empty,
+#gf-candidate-popup levelbar block.empty {
+  background-color: rgba(42, 45, 55, 0.95); }
+
+#gf-bubble levelbar trough,
+#gf-osd-window levelbar trough,
+#gf-input-source-popup levelbar trough,
+#gf-candidate-popup levelbar trough {
+  background: none; }
+
+#gf-input-source {
+  min-height: 32px;
+  min-width: 40px; }
+  #gf-input-source:selected {
+    color: #ffffff;
+    background-color: #5294e2;
+    border-radius: 2px; }
+
+gf-candidate-box label {
+  padding: 3px; }
+
+gf-candidate-box:hover, gf-candidate-box:selected {
+  color: #ffffff;
+  background-color: #5294e2;
+  border-radius: 2px; }
+
 .mate-panel-menu-bar, .mate-panel-menu-bar menubar,
 panel-toplevel.background,
 panel-toplevel.background menubar {
diff --git a/common/gtk-3.0/3.20/gtk-darker.css b/common/gtk-3.0/3.20/gtk-darker.css
index ded7838..bc2691f 100644
--- a/common/gtk-3.0/3.20/gtk-darker.css
+++ b/common/gtk-3.0/3.20/gtk-darker.css
@@ -3339,6 +3339,59 @@ button.documents-favorite:active:hover {
 .tr-workarea overshoot {
   border-color: transparent; }
 
+#gf-bubble, #gf-bubble.solid,
+#gf-osd-window,
+#gf-osd-window.solid,
+#gf-input-source-popup,
+#gf-input-source-popup.solid,
+#gf-candidate-popup,
+#gf-candidate-popup.solid {
+  color: #cfd5de;
+  background-color: rgba(53, 57, 69, 0.95);
+  border: 1px solid rgba(35, 38, 46, 0.95);
+  border-radius: 2px; }
+
+#gf-bubble levelbar block.low, #gf-bubble levelbar block.high, #gf-bubble levelbar block.full,
+#gf-osd-window levelbar block.low,
+#gf-osd-window levelbar block.high,
+#gf-osd-window levelbar block.full,
+#gf-input-source-popup levelbar block.low,
+#gf-input-source-popup levelbar block.high,
+#gf-input-source-popup levelbar block.full,
+#gf-candidate-popup levelbar block.low,
+#gf-candidate-popup levelbar block.high,
+#gf-candidate-popup levelbar block.full {
+  background-color: #5294e2;
+  border-color: #5294e2; }
+
+#gf-bubble levelbar block.empty,
+#gf-osd-window levelbar block.empty,
+#gf-input-source-popup levelbar block.empty,
+#gf-candidate-popup levelbar block.empty {
+  background-color: rgba(42, 45, 55, 0.95); }
+
+#gf-bubble levelbar trough,
+#gf-osd-window levelbar trough,
+#gf-input-source-popup levelbar trough,
+#gf-candidate-popup levelbar trough {
+  background: none; }
+
+#gf-input-source {
+  min-height: 32px;
+  min-width: 40px; }
+  #gf-input-source:selected {
+    color: #ffffff;
+    background-color: #5294e2;
+    border-radius: 2px; }
+
+gf-candidate-box label {
+  padding: 3px; }
+
+gf-candidate-box:hover, gf-candidate-box:selected {
+  color: #ffffff;
+  background-color: #5294e2;
+  border-radius: 2px; }
+
 .mate-panel-menu-bar, .mate-panel-menu-bar menubar,
 panel-toplevel.background,
 panel-toplevel.background menubar {
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 4c6709c..bfcc985 100644
--- a/common/gtk-3.0/3.20/gtk-solid-dark.css
+++ b/common/gtk-3.0/3.20/gtk-solid-dark.css
@@ -3340,6 +3340,59 @@ button.documents-favorite:active:hover {
 .tr-workarea overshoot {
   border-color: transparent; }
 
+#gf-bubble, #gf-bubble.solid,
+#gf-osd-window,
+#gf-osd-window.solid,
+#gf-input-source-popup,
+#gf-input-source-popup.solid,
+#gf-candidate-popup,
+#gf-candidate-popup.solid {
+  color: #cfd5de;
+  background-color: #353945;
+  border: 1px solid #23262e;
+  border-radius: 2px; }
+
+#gf-bubble levelbar block.low, #gf-bubble levelbar block.high, #gf-bubble levelbar block.full,
+#gf-osd-window levelbar block.low,
+#gf-osd-window levelbar block.high,
+#gf-osd-window levelbar block.full,
+#gf-input-source-popup levelbar block.low,
+#gf-input-source-popup levelbar block.high,
+#gf-input-source-popup levelbar block.full,
+#gf-candidate-popup levelbar block.low,
+#gf-candidate-popup levelbar block.high,
+#gf-candidate-popup levelbar block.full {
+  background-color: #5294e2;
+  border-color: #5294e2; }
+
+#gf-bubble levelbar block.empty,
+#gf-osd-window levelbar block.empty,
+#gf-input-source-popup levelbar block.empty,
+#gf-candidate-popup levelbar block.empty {
+  background-color: #2a2d37; }
+
+#gf-bubble levelbar trough,
+#gf-osd-window levelbar trough,
+#gf-input-source-popup levelbar trough,
+#gf-candidate-popup levelbar trough {
+  background: none; }
+
+#gf-input-source {
+  min-height: 32px;
+  min-width: 40px; }
+  #gf-input-source:selected {
+    color: #ffffff;
+    background-color: #5294e2;
+    border-radius: 2px; }
+
+gf-candidate-box label {
+  padding: 3px; }
+
+gf-candidate-box:hover, gf-candidate-box:selected {
+  color: #ffffff;
+  background-color: #5294e2;
+  border-radius: 2px; }
+
 .mate-panel-menu-bar, .mate-panel-menu-bar menubar,
 panel-toplevel.background,
 panel-toplevel.background menubar {
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 5468bd7..47a287a 100644
--- a/common/gtk-3.0/3.20/gtk-solid-darker.css
+++ b/common/gtk-3.0/3.20/gtk-solid-darker.css
@@ -3339,6 +3339,59 @@ button.documents-favorite:active:hover {
 .tr-workarea overshoot {
   border-color: transparent; }
 
+#gf-bubble, #gf-bubble.solid,
+#gf-osd-window,
+#gf-osd-window.solid,
+#gf-input-source-popup,
+#gf-input-source-popup.solid,
+#gf-candidate-popup,
+#gf-candidate-popup.solid {
+  color: #cfd5de;
+  background-color: #353945;
+  border: 1px solid #23262e;
+  border-radius: 2px; }
+
+#gf-bubble levelbar block.low, #gf-bubble levelbar block.high, #gf-bubble levelbar block.full,
+#gf-osd-window levelbar block.low,
+#gf-osd-window levelbar block.high,
+#gf-osd-window levelbar block.full,
+#gf-input-source-popup levelbar block.low,
+#gf-input-source-popup levelbar block.high,
+#gf-input-source-popup levelbar block.full,
+#gf-candidate-popup levelbar block.low,
+#gf-candidate-popup levelbar block.high,
+#gf-candidate-popup levelbar block.full {
+  background-color: #5294e2;
+  border-color: #5294e2; }
+
+#gf-bubble levelbar block.empty,
+#gf-osd-window levelbar block.empty,
+#gf-input-source-popup levelbar block.empty,
+#gf-candidate-popup levelbar block.empty {
+  background-color: #2a2d37; }
+
+#gf-bubble levelbar trough,
+#gf-osd-window levelbar trough,
+#gf-input-source-popup levelbar trough,
+#gf-candidate-popup levelbar trough {
+  background: none; }
+
+#gf-input-source {
+  min-height: 32px;
+  min-width: 40px; }
+  #gf-input-source:selected {
+    color: #ffffff;
+    background-color: #5294e2;
+    border-radius: 2px; }
+
+gf-candidate-box label {
+  padding: 3px; }
+
+gf-candidate-box:hover, gf-candidate-box:selected {
+  color: #ffffff;
+  background-color: #5294e2;
+  border-radius: 2px; }
+
 .mate-panel-menu-bar, .mate-panel-menu-bar menubar,
 panel-toplevel.background,
 panel-toplevel.background menubar {
diff --git a/common/gtk-3.0/3.20/gtk-solid.css b/common/gtk-3.0/3.20/gtk-solid.css
index 22457f2..30fe0c7 100644
--- a/common/gtk-3.0/3.20/gtk-solid.css
+++ b/common/gtk-3.0/3.20/gtk-solid.css
@@ -3343,6 +3343,59 @@ button.documents-favorite:active:hover {
 .tr-workarea overshoot {
   border-color: transparent; }
 
+#gf-bubble, #gf-bubble.solid,
+#gf-osd-window,
+#gf-osd-window.solid,
+#gf-input-source-popup,
+#gf-input-source-popup.solid,
+#gf-candidate-popup,
+#gf-candidate-popup.solid {
+  color: #cfd5de;
+  background-color: #353945;
+  border: 1px solid #23262e;
+  border-radius: 2px; }
+
+#gf-bubble levelbar block.low, #gf-bubble levelbar block.high, #gf-bubble levelbar block.full,
+#gf-osd-window levelbar block.low,
+#gf-osd-window levelbar block.high,
+#gf-osd-window levelbar block.full,
+#gf-input-source-popup levelbar block.low,
+#gf-input-source-popup levelbar block.high,
+#gf-input-source-popup levelbar block.full,
+#gf-candidate-popup levelbar block.low,
+#gf-candidate-popup levelbar block.high,
+#gf-candidate-popup levelbar block.full {
+  background-color: #5294e2;
+  border-color: #5294e2; }
+
+#gf-bubble levelbar block.empty,
+#gf-osd-window levelbar block.empty,
+#gf-input-source-popup levelbar block.empty,
+#gf-candidate-popup levelbar block.empty {
+  background-color: #2a2d37; }
+
+#gf-bubble levelbar trough,
+#gf-osd-window levelbar trough,
+#gf-input-source-popup levelbar trough,
+#gf-candidate-popup levelbar trough {
+  background: none; }
+
+#gf-input-source {
+  min-height: 32px;
+  min-width: 40px; }
+  #gf-input-source:selected {
+    color: #ffffff;
+    background-color: #5294e2;
+    border-radius: 2px; }
+
+gf-candidate-box label {
+  padding: 3px; }
+
+gf-candidate-box:hover, gf-candidate-box:selected {
+  color: #ffffff;
+  background-color: #5294e2;
+  border-radius: 2px; }
+
 .mate-panel-menu-bar, .mate-panel-menu-bar menubar,
 panel-toplevel.background,
 panel-toplevel.background menubar {
diff --git a/common/gtk-3.0/3.20/gtk.css b/common/gtk-3.0/3.20/gtk.css
index bc3037d..2140fbd 100644
--- a/common/gtk-3.0/3.20/gtk.css
+++ b/common/gtk-3.0/3.20/gtk.css
@@ -3343,6 +3343,59 @@ button.documents-favorite:active:hover {
 .tr-workarea overshoot {
   border-color: transparent; }
 
+#gf-bubble, #gf-bubble.solid,
+#gf-osd-window,
+#gf-osd-window.solid,
+#gf-input-source-popup,
+#gf-input-source-popup.solid,
+#gf-candidate-popup,
+#gf-candidate-popup.solid {
+  color: #cfd5de;
+  background-color: rgba(53, 57, 69, 0.95);
+  border: 1px solid rgba(35, 38, 46, 0.95);
+  border-radius: 2px; }
+
+#gf-bubble levelbar block.low, #gf-bubble levelbar block.high, #gf-bubble levelbar block.full,
+#gf-osd-window levelbar block.low,
+#gf-osd-window levelbar block.high,
+#gf-osd-window levelbar block.full,
+#gf-input-source-popup levelbar block.low,
+#gf-input-source-popup levelbar block.high,
+#gf-input-source-popup levelbar block.full,
+#gf-candidate-popup levelbar block.low,
+#gf-candidate-popup levelbar block.high,
+#gf-candidate-popup levelbar block.full {
+  background-color: #5294e2;
+  border-color: #5294e2; }
+
+#gf-bubble levelbar block.empty,
+#gf-osd-window levelbar block.empty,
+#gf-input-source-popup levelbar block.empty,
+#gf-candidate-popup levelbar block.empty {
+  background-color: rgba(42, 45, 55, 0.95); }
+
+#gf-bubble levelbar trough,
+#gf-osd-window levelbar trough,
+#gf-input-source-popup levelbar trough,
+#gf-candidate-popup levelbar trough {
+  background: none; }
+
+#gf-input-source {
+  min-height: 32px;
+  min-width: 40px; }
+  #gf-input-source:selected {
+    color: #ffffff;
+    background-color: #5294e2;
+    border-radius: 2px; }
+
+gf-candidate-box label {
+  padding: 3px; }
+
+gf-candidate-box:hover, gf-candidate-box:selected {
+  color: #ffffff;
+  background-color: #5294e2;
+  border-radius: 2px; }
+
 .mate-panel-menu-bar, .mate-panel-menu-bar menubar,
 panel-toplevel.background,
 panel-toplevel.background menubar {
diff --git a/common/gtk-3.0/3.20/sass/_applications.scss b/common/gtk-3.0/3.20/sass/_applications.scss
index c5882b0..2f4e4cb 100644
--- a/common/gtk-3.0/3.20/sass/_applications.scss
+++ b/common/gtk-3.0/3.20/sass/_applications.scss
@@ -448,6 +448,56 @@ button.documents-favorite:active:hover {
   border-color: transparent; // Remove black border on over- and undershoot
 }
 
+//
+// Gnome Flashback
+//
+#gf-bubble,
+#gf-osd-window,
+#gf-input-source-popup,
+#gf-candidate-popup {
+  &, &.solid {
+    color: lighten($osd_fg_color, 7%);
+    background-color: $osd_bg_color;
+    border: 1px solid darken($osd_bg_color, 8%);
+    border-radius: 2px;
+  }
+
+  levelbar {
+    block {
+      &.low, &.high, &.full {
+        background-color: $selected_bg_color;
+        border-color: $selected_bg_color;
+      }
+      &.empty { background-color: darken($osd_bg_color, 5%); }
+    }
+    trough { background: none; }
+  }
+
+  // FIXME still needs button styling
+}
+
+#gf-input-source {
+  min-height: 32px;
+  min-width: 40px;
+
+  &:selected {
+    color: $selected_fg_color;
+    background-color: $selected_bg_color;
+    border-radius: 2px;
+  }
+}
+
+gf-candidate-box {
+  label { padding: 3px; }
+
+  &:hover,
+  &:selected {
+    color: $selected_fg_color;
+    background-color: $selected_bg_color;
+    border-radius: 2px;
+  }
+}
+
 //
 // Mate/Gnome Flashback Panel
 //