diff --git a/components/Book/Book.tsx b/components/Book/Book.tsx
index ef7dac1..b5175f5 100644
--- a/components/Book/Book.tsx
+++ b/components/Book/Book.tsx
@@ -23,6 +23,7 @@ import { SidenoteContext } from "@/components/Book/Sidenote";
 import { useHasMounted } from "@/hooks/useHasMounted";
 import { usePublicProvider } from "@/hooks/usePublicProvider";
 import { ChapterDef, LinkDesc, UnlockChaptersOnAnswersType } from "@/types";
+import { initCopyButtons } from "@/utils/copyToClipboard";
 
 
 const Chapters = ({chapters: allChapters, bookId, chapterNumbers, unlockChaptersOnAnswers, env, setIsChapterIndexVisible, allAnswers}:
@@ -241,6 +242,27 @@ export const Book = (
     }
   }, [layout]);
 
+  // Expressive code insert scripts into mdx, which are not executed,
+  // so we imitate what they would do.
+  React.useEffect(() => {
+    const run = () => {
+      initCopyButtons(document);
+
+      document.querySelectorAll('.expressive-code pre').forEach((el) => {
+        // reading these forces layout flush
+        // eslint-disable-next-line @typescript-eslint/no-unused-expressions
+        el.scrollWidth;
+        // eslint-disable-next-line @typescript-eslint/no-unused-expressions
+        el.clientWidth;
+      })
+      window.dispatchEvent(new Event('resize'));
+    }
+    run();
+    const obs = new MutationObserver(() => { run(); })
+    obs.observe(document.body, { childList: true, subtree: true });
+    return () => obs.disconnect();
+  }, []);
+
   // If there are no chapters, ensure enough space for any side notes in intro.
   // Doing this in presence of chapters would increase the left margin too much;
   // let us assume that books with chapters don't have side notes in intro.
diff --git a/ingest/md-helpers.ts b/ingest/md-helpers.ts
index 4887332..2ee6453 100644
--- a/ingest/md-helpers.ts
+++ b/ingest/md-helpers.ts
@@ -8,7 +8,14 @@ import rehypeKatex from "rehype-katex";
 import rehypeExpressiveCode from "rehype-expressive-code";
 import { pluginCollapsibleSections } from "@expressive-code/plugin-collapsible-sections";
 
-import { addRelativeDir, forbiddenComponents, rewriteQuestions, replacer, constructReplacer } from "./plugins";
+import {
+  addRelativeDir,
+  forbiddenComponents,
+  rewriteQuestions,
+  replacer,
+  constructReplacer,
+  removeTerminalFrames
+} from "./plugins";
 import { getImageSize } from "./getImageSize";
 import { isDirectory, joinedPath, readPublicDir } from "./paths";
 import {ChapterFrontmatter, CollectionFrontmatter, RawBookFrontmatter} from "@/types";
@@ -187,7 +194,8 @@ export const serializedContent = async (
       addRelativeDir( { relativeDir }),
       getImageSize,
       rewriteQuestions,
-      [rehypeExpressiveCode, rehypeExpressiveCodeOptions]
+      [rehypeExpressiveCode, rehypeExpressiveCodeOptions],
+      removeTerminalFrames
     ],
   });
   return compiled.value as string;
diff --git a/ingest/plugins.ts b/ingest/plugins.ts
index 87ca6d0..254c3f3 100644
--- a/ingest/plugins.ts
+++ b/ingest/plugins.ts
@@ -145,3 +145,26 @@ export const rewriteQuestions = () => (tree: Root) => {
     }
   });
 };
+
+/* Life's too short to try to convince expressive code
+    to stop adding frames to terminal windows, so let's just remove them. */
+export const removeTerminalFrames = () => {
+  return (tree: Root) => {
+    visit(tree, 'element', (node: any) => {
+      if (!node.properties?.className) {
+        return;
+      }
+      const className = node.properties.className
+      if (Array.isArray(className)) {
+        node.properties.className = className.filter(
+          (c) => c !== 'is-terminal'
+        );
+      } else if (typeof className === 'string') {
+        node.properties.className = className
+          .split(' ')
+          .filter((c) => c !== 'is-terminal')
+          .join(' ')
+      }
+    })
+  }
+}
diff --git a/styles/content-index/content-index.scss b/styles/content-index/content-index.scss
index 666ea29..aed2a30 100644
--- a/styles/content-index/content-index.scss
+++ b/styles/content-index/content-index.scss
@@ -15,6 +15,7 @@
   position: absolute;
   top: 24px;
   display: none;
+  max-width: 500px;
 }
 
 .header-content-index:hover .content-index-at-header {
diff --git a/utils/copyToClipboard.ts b/utils/copyToClipboard.ts
new file mode 100644
index 0000000..984a38f
--- /dev/null
+++ b/utils/copyToClipboard.ts
@@ -0,0 +1,47 @@
+const fallbackCopy = (text: string): boolean => {
+  const el = document.createElement('textarea');
+  el.value = text;
+
+  // prevent scroll jump
+  el.style.position = 'fixed';
+  el.style.top = '0';
+  el.style.left = '0';
+  el.style.opacity = '0';
+  el.style.pointerEvents = 'none';
+
+  document.body.appendChild(el);
+  el.focus();
+  el.select();
+
+  let success = false;
+  try {
+    success = document.execCommand('copy');
+  } catch {
+    success = false;
+  }
+
+  document.body.removeChild(el);
+  return success;
+}
+
+export const initCopyButtons = (root = document) => {
+  root.querySelectorAll('.expressive-code .copy button').forEach((btn) => {
+    if ((btn as any)._wired) {
+      return;
+    }
+    (btn as any)._wired = true
+
+    btn.addEventListener('click', async () => {
+      const code = btn.getAttribute('data-code')?.replace(/\u007f/g, '\n');
+      if (!code) {
+        return;
+      }
+
+      try {
+        await navigator.clipboard.writeText(code);
+      } catch {
+        fallbackCopy(code);
+      }
+    })
+  })
+}