Add CSS styles for the leaderboard page

assets/tailwindcss/input.css

@@ -50,3 +50,16 @@ table {
 table th, table td {
   @apply tw-border-solid tw-border-2 tw-border-black tw-px-4 tw-py-2;
 }
+
+section.leaderboard-grid {
+  @apply tw-grid tw-gap-x-8 tw-gap-y-4
+  tw-grid-cols-1 md:tw-grid-cols-2 xl:tw-grid-cols-3;
+}
+
+section.leaderboard-grid caption {
+  @apply tw-text-lg tw-font-bold;
+}
+
+section.leaderboard-grid article.error {
+  @apply tw-my-4 tw-text-red-500 tw-text-lg tw-font-bold;
+}