Update app.py

app.py

@@ -782,7 +782,7 @@ with tab3:
             ax2.plot(graph_data['Date'], graph_data[plot_var2], color = color) 
             ax2.tick_params(axis ='y', labelcolor = color)
             
-            fig.legend()
+            fig.legend([plot_var1, plot_var2], loc="upper right")
              
             buf = BytesIO()
             fig.savefig(buf, format="png")
@@ -806,8 +806,8 @@ with tab3:
             ax2.plot(graph_data['Date'], graph_data[plot_var3], color = color) 
             ax2.tick_params(axis ='y', labelcolor = color)
             
-            fig.legend()
-             
+            fig.legend([plot_var1, plot_var2, plot_var3], loc="upper right")
+            
             buf = BytesIO()
             fig.savefig(buf, format="png")
             st.image(buf)