style(posts): 为文章容器添加浅色/深色模式边框

src/pages/posts/[...slug].astro

@@ -47,7 +47,7 @@ const jsonLd = {
 <MainGridLayout banner={entry.data.image} title={entry.data.title} description={entry.data.description} lang={entry.data.lang} setOGTypeArticle={true} headings={headings}>
     <script is:inline slot="head" type="application/ld+json" set:html={JSON.stringify(jsonLd)}></script>
     <div class="flex w-full rounded-[var(--radius-large)] overflow-hidden relative mb-4">
-        <div id="post-container" class:list={["card-base z-10 px-6 md:px-9 pt-6 pb-4 relative w-full ",
+        <div id="post-container" class:list={["card-base z-10 px-6 md:px-9 pt-6 pb-4 relative w-full border border-black/10 dark:border-white/10 ",
             {}
         ]}>
             <!-- word count and reading time -->