fix bokeh line color for grid

Author: alioacar

docs/user-guide/healpix.ipynb

@@ -149,20 +149,17 @@
     "    ux.Grid.from_healpix(zoom=2).plot(\n",
     "        periodic_elements=\"split\",\n",
     "        projection=ccrs.Orthographic(),\n",
-    "        title=\"zoom=2\",\n",
-    "        backend=\"matplotlib\",\n",
+    "        title=\"zoom=2\"\n",
     "    )\n",
     "    + ux.Grid.from_healpix(zoom=3).plot(\n",
     "        periodic_elements=\"split\",\n",
     "        projection=ccrs.Orthographic(),\n",
-    "        title=\"zoom=3\",\n",
-    "        backend=\"matplotlib\",\n",
+    "        title=\"zoom=3\"\n",
     "    )\n",
     "    + ux.Grid.from_healpix(zoom=4).plot(\n",
     "        periodic_elements=\"split\",\n",
     "        projection=ccrs.Orthographic(),\n",
-    "        title=\"zoom=4\",\n",
-    "        backend=\"matplotlib\",\n",
+    "        title=\"zoom=4\"\n",
     "    )\n",
     ").cols(1)"
    ]
@@ -448,22 +445,8 @@
   }
  ],
  "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3",
-   "language": "python",
-   "name": "python3"
-  },
   "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.14.4"
+   "name": "python"
   }
  },
  "nbformat": 4,

uxarray/plot/accessor.py

@@ -222,6 +222,8 @@ def edges(
             kwargs["projection"] = ccrs.PlateCarree()
         if "clabel" not in kwargs:
             kwargs["clabel"] = "edges"
+        if "color" not in kwargs and "line_color" not in kwargs:
+            kwargs["color"] = "black"
         if "crs" not in kwargs:
             if "projection" in kwargs:
                 central_longitude = kwargs["projection"].proj4_params["lon_0"]