update activity

Author: maptastik

activity_03-01.md

@@ -30,3 +30,4 @@ In this activity you'll be using CartoCSS and TileMill to make a choropleth map
   polygon-opacity:1;
   polygon-fill:#ae8;
 }`<br /><br />These style description give the map it's current look, but there are many properties of the polygon's fill and outline that can be edited. You can access the built-in CartoCSS reference by click the curly-brace button on that vertical stack of buttons mentioned earlier. Additionally, Mapbox includes the [reference](https://github.com/mapbox/carto/blob/master/docs/latest.md) on their GitHub page along with [several examples](https://www.mapbox.com/tilemill/docs/crashcourse/styling/) in the TileMill documentation on their website.<img src="https://maptastik.github.com/os-webmap-workshop/images/tm-ref1.png" width=100% />
+14. Let's change some properties. Change:<br /><br />`line-color:#594;` to `line-color:#000000;`<br />and<br />`polygon-fill:#ae8;` to `polygon-fill:#2980b9;`.<br /><br />Click **Save**. If all is correct, you should have a map of census tracts in Lucas County, OH with a blue fill and black borders.<br /><img src="https://maptastik.github.com/os-webmap-workshop/images/tm-map7.png" width=100% />