Fix dropdowns falling behind site content due to CSS layer priority

src/app/globals.css

@@ -337,9 +337,11 @@ summary,
 		);
 }
 /* Ensure all content sits above the cloud/glow layers */
-.site-bg > * {
-	position: relative;
-	z-index: 1;
+@layer base {
+	.site-bg > * {
+		position: relative;
+		z-index: 1;
+	}
 }
 
 html.dark .site-bg {