diff --git a/Cycloidal Gearbox.md b/Cycloidal Gearbox.md
index 64f6b5a..1ef19bd 100644
--- a/Cycloidal Gearbox.md	
+++ b/Cycloidal Gearbox.md	
@@ -37,13 +37,30 @@ To clearly illustrate the internal mechanics, structural design, and assembly st
 - Included Media
     - **Assembly Video** – starts with an exploded view and step-by-step buildup
 
-        
-        <iframe width="1297" height="387" src="https://www.youtube.com/embed/hN_mbnVWklc" title="Cycloidal Double Disc Bolted Gearbox" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
-    
+        <div style="text-align:center;">
+        <iframe width="560" height="315" 
+                src="https://www.youtube.com/embed/hN_mbnVWklc" 
+                title="YouTube video player" 
+                frameborder="0" 
+                allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" 
+                allowfullscreen>
+        </iframe>
+        </div>
+
 
     - **Disassembly Video** – shows teardown process in reverse order
 
-        <iframe width="560" height="315" src="https://www.youtube.com/embed/ylcnBYmR19A" frameborder="0" allowfullscreen></iframe>
+        <!DOCTYPE html>
+        <html lang="en">
+        <head>
+            <meta charset="UTF-8">
+            <meta name="viewport" content="width=device-width, initial-scale=1.0">
+            <title>YouTube Video Embed</title>
+        </head>
+        <body>
+            <iframe width="560" height="315" src="https://www.youtube.com/embed/ylcnBYmR19A" frameborder="0" allowfullscreen></iframe>
+        </body>
+        </html>
 
     - **Transparent Body Image** – reveals internal components without hiding the casing
 
