Update app.py

app.py

@@ -20,6 +20,14 @@ background-repeat: no-repeat;
 background-attachment: local;
 }}
 
+[data-testid="stSidebar"] > div:first-child {{
+background-image: url("https://kartinkin.net/uploads/posts/2022-12/1670240725_63-kartinkin-net-p-kartinki-neiroseti-instagram-69.jpg");
+background-size: 115%;
+background-position: center; 
+background-repeat: no-repeat;
+background-attachment: fixed;
+}}
+
 [data-testid="stHeader"] {{
 background: rgba(1,1,1,1);
 }}