diff --git a/gtk/theme/HighContrast/_common.scss b/gtk/theme/HighContrast/_common.scss
index f8c42c3f82..1c5cc59105 100644
--- a/gtk/theme/HighContrast/_common.scss
+++ b/gtk/theme/HighContrast/_common.scss
@@ -1801,9 +1801,14 @@ levelbar {
       @include entry(backdrop);
     }
   }
-  &.horizontal block.discrete { margin: 0 1px; }
-  &.vertical block.discrete { margin: 1px 0; }
-  & block.filled {
+  &.horizontal.discrete block { margin: 0 1px; }
+  &.vertical.discrete block { margin: 1px 0; }
+  & block.filled.low {
+    border-color: darken($warning_color,10%);
+    background-color: $warning_color;
+    &:backdrop { border-color: $warning_color; };
+  }
+  & block.filled.high {
     border-width: 1px;
     border-style: solid;
     border-color: darken($selected_bg_color,10%);
@@ -1815,16 +1820,11 @@ levelbar {
       box-shadow: none;
     }
   }
-  & block.level-high {
+  & block.filled.full {
     border-color: darken($success_color,10%);
     background-color: $success_color;
     &:backdrop { border-color: $success_color; }
   }
-  & block.level-low {
-    border-color: darken($warning_color,10%);
-    background-color: $warning_color;
-    &:backdrop { border-color: $warning_color; };
-  }
   & block.empty {
     border-width: 1px;
     border-style: solid;
diff --git a/gtk/theme/HighContrast/gtk.css b/gtk/theme/HighContrast/gtk.css
index 708afce1c1..d2a83b9e4f 100644
--- a/gtk/theme/HighContrast/gtk.css
+++ b/gtk/theme/HighContrast/gtk.css
@@ -1964,30 +1964,30 @@ levelbar trough {
     color: #000;
     background-image: linear-gradient(to bottom, #fff);
     box-shadow: 0 1px rgba(255, 255, 255, 0); }
-levelbar.horizontal block.discrete {
+levelbar.horizontal.discrete block {
   margin: 0 1px; }
-levelbar.vertical block.discrete {
+levelbar.vertical.discrete block {
   margin: 1px 0; }
-levelbar block.filled {
+levelbar block.filled.low {
+  border-color: #c26000;
+  background-color: #f57900; }
+  levelbar block.filled.low:backdrop {
+    border-color: #f57900; }
+levelbar block.filled.high {
   border-width: 1px;
   border-style: solid;
   border-color: black;
   background-color: #000;
   box-shadow: 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 1px; }
-  levelbar block.filled:backdrop {
+  levelbar block.filled.high:backdrop {
     border-color: #000;
     box-shadow: none; }
-levelbar block.level-high {
+levelbar block.filled.full {
   border-color: #5aa411;
   background-color: #73d216; }
-  levelbar block.level-high:backdrop {
+  levelbar block.filled.full:backdrop {
     border-color: #73d216; }
-levelbar block.level-low {
-  border-color: #c26000;
-  background-color: #f57900; }
-  levelbar block.level-low:backdrop {
-    border-color: #f57900; }
 levelbar block.empty {
   border-width: 1px;
   border-style: solid;