[Fix]: Hovering bug of close button in dark theme. (#2034)

src/lib/components/chat/UploadedFile.svelte

@@ -95,7 +95,7 @@
 					</p>
 				{/if}
 				<button
-					class="absolute right-4 top-4 text-xl text-gray-500 hover:text-gray-800"
+					class="absolute right-4 top-4 text-xl text-gray-500 hover:text-gray-800 dark:text-gray-400 dark:hover:text-white"
 					onclick={() => (showModal = false)}
 				>
 					<CarbonClose class="text-xl" />