diff --git a/app.js b/app.js
index 4c71ea3..6ca4cc6 100644
--- a/app.js
+++ b/app.js
@@ -64,6 +64,7 @@ function readMarkdown(md) {
     js: blocks.html.length === 1 ? blocks.js[0].value : undefined,
     css: blocks.html.length === 1 ? blocks.css[0].value : undefined,
   }
+  if (code.html || code.js || code.css) return code
 }
 
 function renderSandbox({html, css, js}) {