Fix dropdowns falling behind site content due to CSS layer priority

src/app/globals.css

@@ -337,10 +337,12 @@ summary,
 		);
 }
 /* Ensure all content sits above the cloud/glow layers */
+@layer base {
 	.site-bg > * {
 		position: relative;
 		z-index: 1;
 	}
+}
 
 html.dark .site-bg {
 	background: linear-gradient(