diff --git a/docs/index.md b/docs/index.md
index 86fa4de..7100817 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -81,6 +81,7 @@ If you like my posts, please consider supporting me on [Liberapay](https://liber
 
 - add tea's badge
 - move build scripts to a Makefile
+- add johnvertisement
 
 ### v1.0.1 (2024-05-18)
 
diff --git a/theme/main.html b/theme/main.html
index 7cf4a22..7fafe6b 100644
--- a/theme/main.html
+++ b/theme/main.html
@@ -132,11 +132,6 @@
       >memetic apiopage</a
     >
 
-    please click on this
-    <a href="https://john.citrons.xyz/embed?ref=tilde.club/~tasiaiso/"
-      >johnvertisement</a
-    >
-
     <br />
     <hr />
 
@@ -168,5 +163,20 @@
     <a href="https://tilde.club">tilde.club</a>.
 
     <br /><br />
+
+    <iframe
+      src="https://john.citrons.xyz/embed?ref=example.com"
+      style="
+        margin-left: auto;
+        display: block;
+        margin-right: auto;
+        max-width: 732px;
+        width: 100%;
+        height: 94px;
+        border: none;
+      "
+    ></iframe>
+
+    <br /><br />
   </body>
 </html>