Update app.py

app.py

@@ -9,6 +9,14 @@ import numpy as np
 
 # Define the HTML and CSS styles
 html_temp = """
+
+<style>
+    body {
+        background-color: #000000;
+        color: #ffffff;
+    }
+</style>
+
 <div style="background-color:black;padding:10px">
 <h1 style="color:white;text-align:center;">My Streamlit App with HTML and CSS</h1>
 </div>