Update app.py

app.py

@@ -2,7 +2,7 @@ import streamlit as st
 
 st.set_page_config(layout="wide")
 
-with open("lunar_lander.html", "r") as f:
+with open("lunar_lander.htm", "r") as f:
     html = f.read()
     
 st.components.v1.html(html, height=450)