diff --git a/build-slides.sh b/build-slides.sh
index dfaf746..417a5c6 100755
--- a/build-slides.sh
+++ b/build-slides.sh
@@ -61,9 +61,10 @@ document.querySelectorAll('code.language-mermaid').forEach(el => {
   const div = document.createElement('div');
   div.className = 'mermaid';
   div.textContent = el.textContent;
-  el.closest('pre').replaceWith(div);
+  el.parentElement.replaceWith(div);
 });
-mermaid.initialize({ startOnLoad: true, theme: 'dark' });
+mermaid.initialize({ startOnLoad: false, theme: 'dark' });
+await mermaid.run();
 </script>"""
 
 with open(path, encoding='utf-8') as f: