fix history chart shadow

src/components/PortfolioValueHistory.svelte

@@ -220,7 +220,7 @@
 		</svg>
 	</div>
 {:else if historyData.length === 0}
-	<div class="w-full max-w-6xl mx-auto bg-white dark:bg-gray-900 p-6 rounded-xl shadow-md">
+	<div class="w-full max-w-6xl mx-auto bg-white dark:bg-gray-900 p-6 rounded-xl shadow">
 		<h3 class="text-xl font-semibold text-gray-800 dark:text-gray-100 mb-4">
 			Portfolio Value History
 		</h3>
@@ -229,7 +229,7 @@
 		</div>
 	</div>
 {:else}
-	<div class="w-full max-w-6xl mx-auto bg-white dark:bg-gray-900 p-6 rounded-xl shadow-md">
+	<div class="w-full max-w-6xl mx-auto bg-white dark:bg-gray-900 p-6 rounded-xl shadow">
 		<h3 class="text-xl font-semibold text-gray-800 dark:text-gray-100 mb-4">
 			Portfolio Value History
 			{#if currentValue !== null}