Improve selected message highlight (#12)

src/lib/components/chat/Messages/MultiResponseMessages.svelte

@@ -225,7 +225,7 @@
 					<div
 						class=" snap-center w-full max-w-full m-1 border {history.messages[messageId]
 							?.modelIdx == modelIdx
-							? `border-gray-100 dark:border-gray-850 border-[1.5px] ${
+							? `bg-gray-100 dark:bg-gray-850 border-gray-200 dark:border-gray-800 border-2 ${
 									$mobile ? 'min-w-full' : 'min-w-80'
 								}`
 							: `border-gray-100 dark:border-gray-850 border-dashed ${