Add counter example; fix configuration

examples/accident-counter/tailwind.config.js

@@ -0,0 +1,13 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: ['./**/*.{html,js,jsx,ts,tsx}'],
+  theme: {
+    extend: {
+      container: {
+        center: true,
+        padding: '1rem',
+      },
+    },
+  },
+  plugins: [],
+};