diff --git a/gtk/theme/HighContrast/_common.scss b/gtk/theme/HighContrast/_common.scss
index e0b0fac969..5e122a2d43 100644
--- a/gtk/theme/HighContrast/_common.scss
+++ b/gtk/theme/HighContrast/_common.scss
@@ -2581,6 +2581,7 @@ levelbar {
   }
 }
 
+
 // catch all extend :)
 
 %selected_items {
@@ -2589,6 +2590,9 @@ levelbar {
   &:backdrop { background-color: $borders_color; color: $selected_fg_color; }
 }
 
+.monospace { font-family: monospace; }
+
+
 /**********
  * frames *
  **********/
diff --git a/gtk/theme/HighContrast/gtk-contained-inverse.css b/gtk/theme/HighContrast/gtk-contained-inverse.css
index e8455a9c1e..7c9f043707 100644
--- a/gtk/theme/HighContrast/gtk-contained-inverse.css
+++ b/gtk/theme/HighContrast/gtk-contained-inverse.css
@@ -1150,6 +1150,8 @@ levelbar block.empty:backdrop { border-color: rgba(255, 255, 255, 0.15); }
 
 .view:backdrop:selected, textview text:backdrop:selected, iconview:backdrop:selected, calendar:backdrop:selected, textview text:backdrop:selected:focus, iconview:backdrop:selected:focus, calendar:backdrop:focus:selected, textview text:backdrop:selected:hover, iconview:backdrop:selected:hover, calendar:backdrop:hover:selected, textview text selection:backdrop, flowbox flowboxchild:backdrop:selected, label selection:backdrop, spinbutton:not(.vertical) selection:backdrop, entry selection:backdrop, modelbutton.flat:backdrop:selected, popover.background checkbutton:backdrop:selected, popover.background radiobutton:backdrop:selected, .menuitem.button.flat:backdrop:selected, row.activatable:backdrop:selected, .sidebar:backdrop:selected { background-color: gray; color: #000; }
 
+.monospace { font-family: monospace; }
+
 /********** frames * */
 frame, .frame { border: 1px solid gray; padding: 0; }
 
diff --git a/gtk/theme/HighContrast/gtk-contained.css b/gtk/theme/HighContrast/gtk-contained.css
index 5259b8e828..7f5dcd70b0 100644
--- a/gtk/theme/HighContrast/gtk-contained.css
+++ b/gtk/theme/HighContrast/gtk-contained.css
@@ -1156,6 +1156,8 @@ levelbar block.empty:backdrop { border-color: rgba(0, 0, 0, 0.15); }
 
 .view:backdrop:selected, textview text:backdrop:selected, iconview:backdrop:selected, calendar:backdrop:selected, textview text:backdrop:selected:focus, iconview:backdrop:selected:focus, calendar:backdrop:focus:selected, textview text:backdrop:selected:hover, iconview:backdrop:selected:hover, calendar:backdrop:hover:selected, textview text selection:backdrop, flowbox flowboxchild:backdrop:selected, label selection:backdrop, spinbutton:not(.vertical) selection:backdrop, entry selection:backdrop, modelbutton.flat:backdrop:selected, popover.background checkbutton:backdrop:selected, popover.background radiobutton:backdrop:selected, .menuitem.button.flat:backdrop:selected, row.activatable:backdrop:selected, .sidebar:backdrop:selected { background-color: gray; color: #fff; }
 
+.monospace { font-family: monospace; }
+
 /********** frames * */
 frame, .frame { border: 1px solid gray; padding: 0; }