update style

src/pages/index.tsx

@@ -125,13 +125,15 @@ const OpenSourceHeatmap: React.FC<{ policyData: PolicyData[] }> = ({
   policyData,
 }) => {
   return (
-    <div className="w-full max-w-screen-lg mx-auto p-4 py-16 dark:bg-gray-900 dark:text-white">
-      <h1 className="text-3xl lg:text-5xl mt-16 font-bold text-center mb-2">
-        China AI policy research 🤗
-      </h1>
-      
-      <AIPoliciesTable policies={policyData} />
-      
+    <div className="w-full min-h-screen bg-white dark:bg-gray-900 dark:text-white">
+      <div className="max-w-screen-lg mx-auto p-4 py-16">
+        <h1 className="text-3xl lg:text-5xl mt-16 font-bold text-center mb-2">
+          China AI policy research 🤗
+        </h1>
+        
+        <AIPoliciesTable policies={policyData} />
+      </div>
+
       {/* <div className="text-center text-sm my-8 space-y-4">
         <p>
           Models, Datasets, and Spaces from the top AI labs.