Update post title styling

src/pages/posts/[slug].astro

@@ -23,7 +23,7 @@ const { Content } = await post.render();
 <Layout title={post.data.title} description={post.data.description}>
   <main class="post mx-auto flex w-full max-w-prose flex-col gap-4">
     <header role="presentation">
-      <h1 class="text-md">
+      <h1 class="text-lg">
         {post.data.title} - {formatDate(post.data.publishedAt)}
       </h1>
       <p class="italic">{post.data.description}</p>