diff --git a/astro.config.mjs b/astro.config.mjs
index f7982f6..e1b528a 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -17,6 +17,11 @@ export default defineConfig({
   },
   markdown: {
     rehypePlugins: [rehypeSlug],
-    shikiConfig: { theme: 'github-light' },
+    shikiConfig: {
+      theme: 'github-light',
+      // ```small — plain text, rendered at a smaller size (see PostLayout's
+      // `pre[data-language="small"]` rule). Useful for wide terminal traces.
+      langAlias: { small: 'text' },
+    },
   },
 });
diff --git a/src/layouts/PostLayout.astro b/src/layouts/PostLayout.astro
index a89f586..35e9068 100644
--- a/src/layouts/PostLayout.astro
+++ b/src/layouts/PostLayout.astro
@@ -94,6 +94,10 @@ if (!isHtml) {
       padding: 12px;
       overflow-x: auto;
     }
+    /* ```small — plain-text blocks set a size down, so wide terminal traces
+       fit the column without wrapping or horizontal scrolling. */
+    .prose-body pre[data-language="small"] { font-size: 0.7em; line-height: 1.5; }
+    .prose-body pre[data-language="small"] code { font-size: 1em; }
     /* Inside a block, the <pre> already carries the chip treatment. */
     .prose-body pre code {
       color: inherit;