Update app.py

app.py

@@ -218,7 +218,7 @@ def plot_stock_chart(df: pd.DataFrame, company_name: str) -> plt.Figure:
     ax.set_xlabel('Date', fontsize=12)
     ax.set_ylabel('Price', fontsize=12)
     ax.legend()
-    ax.grid(True, linestyle='--', alpha=0.6)
+    ax.grid(True, axis='y', linestyle='--', alpha=0.6)
     plt.xticks(x, ticks, rotation=30)
     plt.tight_layout()
     return fig