It’s not always obvious on a map which feature an outline or label belongs to. Using the same color as the symbol can help to clarify your cartography. This video shows examples of designing maps with matching colors in both ArcGIS Online and ArcGIS Pro. 

• Follow along with the map in ArcGIS Online: https://www.maps.arcgis.com/home/item.html?id=c8853977fdc3407f8cee3ff3fbd64ecc
• Follow along with the map in ArcGIS Pro: https://www.arcgis.com/home/item.html?id=616b2d3b71df44e7981a48e7b885244e
• Find the data at Halifax Open Data: https://catalogue-hrm.opendata.arcgis.com/