write URL in grey

index.html

@@ -374,6 +374,7 @@
             ctx.save()
             ctx.translate(CANVAS_WIDTH - MARGIN_CANVAS, CANVAS_HEIGHT - MARGIN_CANVAS)
             ctx.rotate(-Math.PI/2);
+            ctx.fillStyle = "grey";
             ctx.fillText (address, 0, 0);
             ctx.restore()
           }