diff --git a/owid/grapher/__init__.py b/owid/grapher/__init__.py
index 95ca70f..440106a 100644
--- a/owid/grapher/__init__.py
+++ b/owid/grapher/__init__.py
@@ -396,6 +396,7 @@ def generate_iframe(config: Dict[str, Any]) -> str:
     iframe_name = "".join(random.choice(string.ascii_lowercase) for _ in range(20))
     iframe_contents = f"""
 <!DOCTYPE html>
+<!-- https://ourworldindata.org/assets -->
 <html>
   <head>
     <meta name="viewport" content="width=device-width, initial-scale=1" />
@@ -403,11 +404,15 @@ def generate_iframe(config: Dict[str, Any]) -> str:
       href="https://fonts.googleapis.com/css?family=Lato:300,400,400i,700,700i|Playfair+Display:400,700&amp;display=swap"
       rel="stylesheet"
     />
+
     <link
       rel="stylesheet"
-      href="https://ourworldindata.org/assets/common.css"
+      href="./common.css"
+    />
+    <link
+        rel="stylesheet"
+        href="./owid.css"
     />
-    <link rel="stylesheet" href="https://ourworldindata.org/assets/owid.css" />
     <meta property="og:image:width" content="850" />
     <meta property="og:image:height" content="600" />
     <script>
@@ -422,8 +427,8 @@ def generate_iframe(config: Dict[str, Any]) -> str:
     </main>
       <div class="site-tools"></div>
       <script src="https://polyfill.io/v3/polyfill.min.js?features=es6,fetch,URL,IntersectionObserver,IntersectionObserverEntry"></script>
-      <script type="module" src="https://ourworldindata.org/assets/common.mjs"></script>
-      <script type="module" src="https://ourworldindata.org/assets/owid.mjs"></script>
+      <script type="module" src="./common.mjs"></script>
+      <script type="module" src="./owid.mjs"></script>
       <script type="module">
         var jsonConfig = {json.dumps(config)};
         jsonConfig.owidDataset = new Map(Object.entries(jsonConfig.owidDataset).map(([key, value]) => [parseInt(key), value]));
