bug fix

app.py

@@ -120,7 +120,7 @@ plt.tight_layout()
 
 for ax in axs.flat:
     ax.set_xlim(df['Date'].min(), df['Date'].max())
-    ax.set_ylim(df['Sales'].min(), df['sales'].max())
+    ax.set_ylim(df['sales'].min(), df['sales'].max())
 
 st.pyplot(fig)