Update app.py

app.py

@@ -1,6 +1,7 @@
 import streamlit as st
 import pandas as pd
- 
+import base64
+
 st.set_page_config(
     page_title="app",
     page_icon="📈",
@@ -39,4 +40,19 @@ text-align: center;
 <p>Developed with ❤ by DataAi Team. Please contact us at +91 12-32130332</p>
 </div>
 """
-st.markdown(footer,unsafe_allow_html=True)   
+st.markdown(footer,unsafe_allow_html=True)   
+
+main_bg_ext = "jpg"
+main_bg = "vally.jpg"
+        
+st.markdown(
+ f"""
+ <style>
+ .stApp {{
+     background: url(data:image/{main_bg_ext};base64,{base64.b64encode(open(main_bg, "rb").read()).decode()});
+     background-size: cover
+ }}
+ </style>
+ """,
+ unsafe_allow_html=True
+)