ui: share tailwind config across packages

apps/portal/src/pages/index.tsx

@@ -1,8 +1,16 @@
+import { Button, CounterButton } from '@tih/ui';
+
 export default function HomePage() {
   return (
     <main className="flex-1 overflow-y-auto">
       <div className="flex h-full items-center justify-center">
-        <h1 className="text-center font-bold text-4xl">Homepage</h1>
+        <div>
+          <h1 className="text-center text-4xl font-bold text-red-600">
+            Homepage
+          </h1>
+          <CounterButton />
+          <Button label="Button text" size="md" variant="primary" />
+        </div>
       </div>
     </main>
   );