docs: Added extra Elevation CSS example

Author: morehawes

docs/examples/elevation-profile-colours/index.html

@@ -35,6 +35,10 @@
         fill: purple !important;
       }
 
+      div.waymark-elevation-container .elevation-control.elevation .area {
+        stroke: orange !important;
+      }
+
       div.waymark-container .elevation-polyline {
         filter: drop-shadow(1px 1px 0 orange) drop-shadow(-1px -1px 0 orange)
           drop-shadow(1px -1px 0 orange) drop-shadow(-1px 1px 0 orange);
@@ -67,7 +71,11 @@ <h1>Elevation Profile Colours</h1>
 }
 div.waymark-container .waymark-elevation .elevation-control.elevation .area {
   fill: purple !important
-}</code></pre>
+}
+div.waymark-elevation-container .elevation-control.elevation .area {
+  stroke: orange !important;
+}
+</code></pre>
       <p>
         Lines with active Elevation Profiles have a white border around them,
         this is white by default and can be changed like so: