add scatter tip lines

app.py

@@ -115,7 +115,16 @@ def main():
         "y": [y_s[plot_idx]],
         "mode": "markers"
     })
-    figure = go.Figure(data=[scatter, scatter_tip], layout=layout)
+    scatter_tip_lines = go.Scatter({
+        "x": [0, x_s[plot_idx]],
+        "y": [y_s[plot_idx]] * 2,
+        "mode": "lines",
+        "line": {
+            "color": "grey",
+            "dash": "dash"
+        }
+    })
+    figure = go.Figure(data=[scatter, scatter_tip, scatter_tip_lines], layout=layout)
     figure.update_layout(paper_bgcolor="#FFFFFF", plot_bgcolor='#FFFFFF', showlegend="false")
     st.plotly_chart(figure)
     auth_token = os.environ.get('TOKEN') or True