diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index 547e382f13..cb5ea28dbd 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -1765,7 +1765,7 @@ infobar.info selection, infobar.question selection, infobar.warning selection, i
 /************ Tooltips * */
 tooltip { padding: 4px; border-radius: 5px; box-shadow: none; text-shadow: 0 1px black; }
 
-tooltip.background { background-color: white; background-clip: padding-box; border: 1px solid rgba(255, 255, 255, 0.1); }
+tooltip.background { background-color: rgba(0, 0, 0, 0.8); background-clip: padding-box; border: 1px solid rgba(255, 255, 255, 0.1); }
 
 tooltip decoration { background-color: transparent; }
 
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index e4fb55ac84..b868e556d1 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -1785,7 +1785,7 @@ infobar.info selection, infobar.question selection, infobar.warning selection, i
 /************ Tooltips * */
 tooltip { padding: 4px; border-radius: 5px; box-shadow: none; text-shadow: 0 1px black; }
 
-tooltip.background { background-color: white; background-clip: padding-box; border: 1px solid rgba(255, 255, 255, 0.1); }
+tooltip.background { background-color: rgba(0, 0, 0, 0.8); background-clip: padding-box; border: 1px solid rgba(255, 255, 255, 0.1); }
 
 tooltip decoration { background-color: transparent; }