refac: styling

src/lib/components/chat/MessageInput.svelte

@@ -998,7 +998,7 @@
 											id="send-message-button"
 											class="{prompt !== ''
 												? 'bg-black text-white hover:bg-gray-900 dark:bg-white dark:text-black dark:hover:bg-gray-100 '
-												: 'text-white bg-gray-100 dark:text-gray-900 dark:bg-gray-800 disabled'} transition rounded-full p-1.5 self-center"
+												: 'text-white bg-gray-200 dark:text-gray-900 dark:bg-gray-700 disabled'} transition rounded-full p-1.5 self-center"
 											type="submit"
 											disabled={prompt === ''}
 										>