diff --git a/docs/_sass/custom/custom.scss b/docs/_sass/custom/custom.scss
index 4d0d08a..ac0cfbd 100644
--- a/docs/_sass/custom/custom.scss
+++ b/docs/_sass/custom/custom.scss
@@ -92,10 +92,10 @@ thead {
 
 .js-table-head-wrapper[data-is-fixed="true"] {
   @media (prefers-color-scheme: dark) {
-    box-shadow: 0px 20px 20px -20px rgb($body-background-color, 0.3);
+    box-shadow: 0px 20px 20px -20px $body-background-color;
   }
   @media (prefers-color-scheme: light) {
-    box-shadow: 0px 20px 20px -20px rgb($body-text-color, 0.3);
+    box-shadow: 0px 20px 20px -20px rgba($body-text-color, 0.3);
   }
   transition: box-shadow ease 500ms;
 }