		console.log("enter", response);
			// add to color to current step
			response.element.classList.add("is-active");
		}

		function handleStepExit(response) {
			// response = { element, direction, index }
			console.log("exit", response);
			// remove color from current step
			response.element.classList.remove("is-active");
		}

		function handleStepProgress(response) {
			console.log(response.progress);
			d3.select(response.element)
				.select("p")
				.text(d3.format(".1%")(response.progress));
		}

