simple background colors

src/main.js

@@ -187,6 +187,12 @@ class Demo {
 	}
 
 	draw({context, scale, tilePoints}) {
+		this.tessellate.background({
+			red: 64,
+			green: 32,
+			blue: 128,
+		});
+
 		tilePoints.forEach(tilePoint => this.drawTile(tilePoint, context, scale));
 
 		const now = Date.now();