diff --git a/docs/src/content/guides/theming.mdx b/docs/src/content/guides/theming.mdx
new file mode 100644
index 0000000..76c6cd6
--- /dev/null
+++ b/docs/src/content/guides/theming.mdx
@@ -0,0 +1,19 @@
+---
+title: "Theming"
+groupTitle: "Introduction"
+sort: 3
+---
+
+You can customize the look and feel of the driver by applying CSS to following classes.
+
+```css
+/* Applied to the `body` when the driver: */
+.driver-active {}  /* is active */
+.driver-fade {}    /* is animated */
+.driver-simple {}  /* is not animated */
+```
+
+Following classes are applied to the overlay element (i.e. called stage.
+
+```css
+.driver-stage {}
\ No newline at end of file
diff --git a/src/driver.ts b/src/driver.ts
index 1a37c72..43d1376 100644
--- a/src/driver.ts
+++ b/src/driver.ts
@@ -1,5 +1,5 @@
 import { AllowedButtons, destroyPopover, Popover } from "./popover";
-import { destroyStage } from "./stage";
+import { destroyOverlay } from "./overlay";
 import { destroyEvents, initEvents, requireRefresh } from "./events";
 import { Config, configure, DriverHook, getConfig } from "./config";
 import { destroyHighlight, highlight } from "./highlight";
@@ -57,19 +57,40 @@ export function driver(options: Config = {}) {
   }
 
   function handleArrowLeft() {
-    const steps = getConfig("steps") || [];
+    const isTransitioning = getState("__transitionCallback");
+    if (isTransitioning) {
+      return;
+    }
+
+    const activeIndex = getState("activeIndex");
+    const activeStep = getState("activeStep");
+    const activeElement = getState("activeElement");
+    if (typeof activeIndex === "undefined" || typeof activeStep === "undefined") {
+      return;
+    }
+
     const currentStepIndex = getState("activeIndex");
     if (typeof currentStepIndex === "undefined") {
       return;
     }
 
-    const previousStepIndex = currentStepIndex - 1;
-    if (steps[previousStepIndex]) {
-      drive(previousStepIndex);
+    const onPrevClick = activeStep.popover?.onPrevClick || getConfig("onPrevClick");
+    if (onPrevClick) {
+      return onPrevClick(activeElement, activeStep, {
+        config: getConfig(),
+        state: getState(),
+      });
     }
+
+    movePrevious();
   }
 
   function handleArrowRight() {
+    const isTransitioning = getState("__transitionCallback");
+    if (isTransitioning) {
+      return;
+    }
+
     const activeIndex = getState("activeIndex");
     const activeStep = getState("activeStep");
     const activeElement = getState("activeElement");
@@ -113,8 +134,9 @@ export function driver(options: Config = {}) {
     }
 
     if (!steps[stepIndex]) {
-      console.warn(`Step not found at index: ${stepIndex}`);
       destroy();
+
+      return;
     }
 
     setState("activeIndex", stepIndex);
@@ -185,7 +207,7 @@ export function driver(options: Config = {}) {
     destroyEvents();
     destroyPopover();
     destroyHighlight();
-    destroyStage();
+    destroyOverlay();
     destroyEmitter();
 
     resetState();
diff --git a/src/highlight.ts b/src/highlight.ts
index 208e534..b2aa203 100644
--- a/src/highlight.ts
+++ b/src/highlight.ts
@@ -1,5 +1,5 @@
 import { DriveStep } from "./driver";
-import { refreshStage, trackActiveElement, transitionStage } from "./stage";
+import { refreshOverlay, trackActiveElement, transitionStage } from "./overlay";
 import { getConfig } from "./config";
 import { repositionPopover, renderPopover, hidePopover } from "./popover";
 import { bringInView } from "./utils";
@@ -51,7 +51,7 @@ export function refreshActiveHighlight() {
   }
 
   trackActiveElement(activeHighlight);
-  refreshStage();
+  refreshOverlay();
   repositionPopover(activeHighlight, activeStep);
 }
 
diff --git a/src/stage.ts b/src/overlay.ts
similarity index 84%
rename from src/stage.ts
rename to src/overlay.ts
index 2088bc4..ea95ca1 100644
--- a/src/stage.ts
+++ b/src/overlay.ts
@@ -31,7 +31,7 @@ export function transitionStage(elapsed: number, duration: number, from: Element
     height,
   };
 
-  renderStage(activeStagePosition);
+  renderOverlay(activeStagePosition);
   setState("__activeStagePosition", activeStagePosition);
 }
 
@@ -51,18 +51,18 @@ export function trackActiveElement(element: Element) {
 
   setState("__activeStagePosition", activeStagePosition);
 
-  renderStage(activeStagePosition);
+  renderOverlay(activeStagePosition);
 }
 
-export function refreshStage() {
+export function refreshOverlay() {
   const activeStagePosition = getState("__activeStagePosition");
-  const stageSvg = getState("__stageSvg");
+  const overlaySvg = getState("__overlaySvg");
 
   if (!activeStagePosition) {
     return;
   }
 
-  if (!stageSvg) {
+  if (!overlaySvg) {
     console.warn("No stage svg found.");
     return;
   }
@@ -70,14 +70,14 @@ export function refreshStage() {
   const windowX = window.innerWidth;
   const windowY = window.innerHeight;
 
-  stageSvg.setAttribute("viewBox", `0 0 ${windowX} ${windowY}`);
+  overlaySvg.setAttribute("viewBox", `0 0 ${windowX} ${windowY}`);
 }
 
-function mountStage(stagePosition: StageDefinition) {
-  const stageSvg = createStageSvg(stagePosition);
-  document.body.appendChild(stageSvg);
+function mountOverlay(stagePosition: StageDefinition) {
+  const overlaySvg = createOverlaySvg(stagePosition);
+  document.body.appendChild(overlaySvg);
 
-  onDriverClick(stageSvg, e => {
+  onDriverClick(overlaySvg, e => {
     const target = e.target as SVGElement;
     if (target.tagName !== "path") {
       return;
@@ -86,20 +86,20 @@ function mountStage(stagePosition: StageDefinition) {
     emit("overlayClick");
   });
 
-  setState("__stageSvg", stageSvg);
+  setState("__overlaySvg", overlaySvg);
 }
 
-function renderStage(stagePosition: StageDefinition) {
-  const stageSvg = getState("__stageSvg");
+function renderOverlay(stagePosition: StageDefinition) {
+  const overlaySvg = getState("__overlaySvg");
 
   // TODO: cancel rendering if element is not visible
-  if (!stageSvg) {
-    mountStage(stagePosition);
+  if (!overlaySvg) {
+    mountOverlay(stagePosition);
 
     return;
   }
 
-  const pathElement = stageSvg.firstElementChild as SVGPathElement | null;
+  const pathElement = overlaySvg.firstElementChild as SVGPathElement | null;
   if (pathElement?.tagName !== "path") {
     throw new Error("no path element found in stage svg");
   }
@@ -107,7 +107,7 @@ function renderStage(stagePosition: StageDefinition) {
   pathElement.setAttribute("d", generateStageSvgPathString(stagePosition));
 }
 
-function createStageSvg(stage: StageDefinition): SVGSVGElement {
+function createOverlaySvg(stage: StageDefinition): SVGSVGElement {
   const windowX = window.innerWidth;
   const windowY = window.innerHeight;
 
@@ -170,9 +170,9 @@ function generateStageSvgPathString(stage: StageDefinition) {
     M${highlightBoxX},${highlightBoxY} h${highlightBoxWidth} a${normalizedRadius},${normalizedRadius} 0 0 1 ${normalizedRadius},${normalizedRadius} v${highlightBoxHeight} a${normalizedRadius},${normalizedRadius} 0 0 1 -${normalizedRadius},${normalizedRadius} h-${highlightBoxWidth} a${normalizedRadius},${normalizedRadius} 0 0 1 -${normalizedRadius},-${normalizedRadius} v-${highlightBoxHeight} a${normalizedRadius},${normalizedRadius} 0 0 1 ${normalizedRadius},-${normalizedRadius} z`;
 }
 
-export function destroyStage() {
-  const stageSvg = getState("__stageSvg");
-  if (stageSvg) {
-    stageSvg.remove();
+export function destroyOverlay() {
+  const overlaySvg = getState("__overlaySvg");
+  if (overlaySvg) {
+    overlaySvg.remove();
   }
 }
diff --git a/src/state.ts b/src/state.ts
index 97f85eb..872bc66 100644
--- a/src/state.ts
+++ b/src/state.ts
@@ -1,4 +1,4 @@
-import { StageDefinition } from "./stage";
+import { StageDefinition } from "./overlay";
 import { PopoverDOM } from "./popover";
 import { DriveStep } from "./driver";
 
@@ -17,7 +17,7 @@ export type State = {
   __resizeTimeout?: number;
   __transitionCallback?: () => void;
   __activeStagePosition?: StageDefinition;
-  __stageSvg?: SVGSVGElement;
+  __overlaySvg?: SVGSVGElement;
 };
 
 let currentState: State = {};