fix: close #204

Author: uriahf

src/rtichoke/helpers/plotly_helper_functions.py

@@ -1184,13 +1184,16 @@ def _create_curve_layout(
         "xaxis": {"showgrid": False},
         "yaxis": {"showgrid": False},
         "plot_bgcolor": "rgba(0, 0, 0, 0)",
+        "paper_bgcolor": "rgba(0, 0, 0, 0)",
         "showlegend": True,
         "legend": {
             "orientation": "h",
             "xanchor": "center",
             "yanchor": "top",
             "x": 0.5,
             "y": 1.3,
+            "bgcolor": "rgba(0, 0, 0, 0)",
+            "bordercolor": "rgba(0, 0, 0, 0)",
         },
         "height": size + 50,
         "width": size,