diff --git a/src/styles/constant.css b/src/styles/constant.css
index 7b9bfda..6b9bb62 100644
--- a/src/styles/constant.css
+++ b/src/styles/constant.css
@@ -24,6 +24,7 @@
 @define-color glass-surface-2 alpha(@background, 0.45);
 @define-color glass-surface-3 alpha(@background, 0.60);
 @define-color glass-surface-4 alpha(@background, 0.75);
+@define-color glass-surface-solid alpha(@background, 0.90);
 
 /* Glass Panels */