Adding styles for a webpage.

2025/index.php

@@ -2,4 +2,16 @@
 
 require_once __DIR__ . '/vendor/autoload.php';
 
-echo "These are the results of the AoC 2025 challenge:\n";
+use Aoc2025\Days\Day1;
+use Aoc2025\Services\Template;
+
+$day_1 = new Day1();
+$day_1_answer = $day_1->run();
+
+$template = new Template('main.html');
+$substitutions = [
+  'day_1_answer' => $day_1_answer,
+];
+$response = $template->render($substitutions);
+
+echo $response;