Add custom class for additional circle marker for styling

src/methods/_showPointTooltip.js

@@ -47,6 +47,7 @@
 
         // Add a ring around the data point
         chart._tooltipGroup.append("circle")
+            .attr("class", "dimple-line-marker-circle " + chart.customClassList.lineMarkerCircle)
             .attr("cx", cx)
             .attr("cy", cy)
             .attr("r", r)

src/objects/chart/methods/customClassList.js

@@ -10,6 +10,7 @@
             tooltipLabel: 'dimple-custom-tooltip-label',
             tooltipDropLine: 'dimple-custom-tooltip-dropline',
             lineMarker: 'dimple-custom-line-marker',
+            lineMarkerCircle: 'dimple-custom-line-marker-circle',
             legendLabel: 'dimple-custom-legend-label',
             legendKey: 'dimple-custom-legend-key',
             areaSeries: 'dimple-custom-series-area',
@@ -30,4 +31,4 @@
                 'dimple-custom-format-9',
                 'dimple-custom-format-10'
             ]
-        };
+        };