Change plot background's gray to match the Clear button's gray for visibility

app.py

@@ -86,7 +86,7 @@ def get_bar_chart(df):
         title=f"Last Modified {last_update_time}",
         showlegend=False,
         modebar_remove=["lasso2d", "select2d"],
-        plot_bgcolor="#FAFAFA",
+        plot_bgcolor="#E4E4E6",
         xaxis_fixedrange=True,
         xaxis_range=[0, max_index + 1],
         xaxis_showticklabels=False,