Update hero section background

Author: bnubald

src/assets/images/posts/jan25-ai-uk-25/AI_UK_25_demo_stand_scene_with_header.svg

@@ -25,7 +25,7 @@ const background_image_class =
 
 const background_text_style =
   image !== undefined
-    ? 'z-10 bg-gray-200/40 dark:bg-gray-500/20 rounded-lg backdrop-blur-xs'
+    ? 'z-10 bg-white/20 dark:bg-gray-800/30 rounded-xl backdrop-blur-md border border-white/30 shadow-lg'
     : '';
 
 const headerHeight_sm = '72px';