diff --git a/examples/fiverthirtyeight-example/pages/datasets/[datasetName].tsx b/examples/fiverthirtyeight-example/pages/datasets/[datasetName].tsx
index a4363449..56cb0cc9 100644
--- a/examples/fiverthirtyeight-example/pages/datasets/[datasetName].tsx
+++ b/examples/fiverthirtyeight-example/pages/datasets/[datasetName].tsx
@@ -60,7 +60,7 @@ export default function DatasetPage({
           <>
             <h2 className="mb-0 mt-10">PREVIEWS</h2>
             {dataset.files?.map((file) => (
-              <div className="preview-table my-8">
+              <div key={file} className="preview-table my-8">
                 <Table url={file} />
               </div>
             ))}
diff --git a/examples/fiverthirtyeight-example/tailwind.config.js b/examples/fiverthirtyeight-example/tailwind.config.js
index b2a373c7..fe3a9c32 100644
--- a/examples/fiverthirtyeight-example/tailwind.config.js
+++ b/examples/fiverthirtyeight-example/tailwind.config.js
@@ -14,7 +14,6 @@ module.exports = {
       },
     },
   },
-  plugins: [
-    require('@tailwindcss/typography')
-  ],
-}
+  safelist: ['w-6', 'h-6', 'opacity-100'],
+  plugins: [require('@tailwindcss/typography')],
+};