Update app.py

app.py

@@ -20,10 +20,9 @@ page_bg_img = f"""
 <style>
 [data-testid="stAppViewContainer"] > .main {{
 background-image: url("https://i.pinimg.com/originals/6f/6c/15/6f6c1538b050072b002dbc06bedaaf90.jpg");
-background-size: 180%;
-background-position: top left;
+background-size: cover;
+background-position: center;
 background-repeat: no-repeat;
-background-attachment: local;
 }}
 
 [data-testid="stSidebar"] > div:first-child {{