diff --git a/docs/development/03biomaterial.md b/docs/development/03biomaterial.md
index 46cdc93628351de88d0c4dfd3c10abef8bc1d1a5..3d3cbd70f2efbab039ecdf0d084922d2e5e15c36 100644
--- a/docs/development/03biomaterial.md
+++ b/docs/development/03biomaterial.md
@@ -32,7 +32,7 @@
 
 **In this video, Cory Morrison demonstrates how to make a mold and deckle with photo frames.**
 
-<iframe width="560" height="315" src="https://www.youtube.com/embed/3jSq1YfvBjM?si=NNRPv56aJ-TnvT20" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
+<iframe width="1000" height="400" src="https://www.youtube.com/embed/3jSq1YfvBjM?si=NNRPv56aJ-TnvT20" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
 
 
 ![flowers](../images/biomaterials/mad.jpg){ width=1000 }