diff --git a/README.md b/README.md
index a96d1dc..5f52c52 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,18 @@ const App = () => {
       options: {
         highLightPadding: 12,
         infoBoxHeight: 220,
+        infoBoxWidth: '24rem',
         infoBoxMargin: 24,
+        overlayColor: 'rgba(15, 23, 42, 0.6)',
+        highlightBorderColor: '#22c55e',
+        highlightBorderRadius: 16,
+        zIndex: 3000,
+        labels: {
+          prev: 'Back',
+          next: 'Continue',
+          skip: 'Dismiss',
+          done: 'Finish',
+        },
         keyboardNavigation: true,
         closeOnOverlayClick: true,
         onClose: () => {
@@ -87,6 +98,10 @@ const App = () => {
 
 `highLightPadding` expands the highlight frame around the target element. It defaults to `8` pixels and applies to the rendered highlight box as well as the info box anchor position.
 
+Use `overlayColor`, `highlightBorderColor`, `highlightBorderRadius`, `zIndex`, and `infoBoxWidth` to match the built-in UI to your product without changing the overlay, highlight, or info box structure. When omitted, the existing defaults remain in place.
+
+Use `labels` to override the built-in button text. The default labels are `이전`, `다음`, `건너뛰기`, and `완료`.
+
 Keyboard navigation is enabled by default while the overlay is open:
 
 - `Escape` closes the tutorial.
diff --git a/packages/document/src/pages/docs/tutorial-overlay.mdx b/packages/document/src/pages/docs/tutorial-overlay.mdx
index 68aa0c7..059aaf2 100644
--- a/packages/document/src/pages/docs/tutorial-overlay.mdx
+++ b/packages/document/src/pages/docs/tutorial-overlay.mdx
@@ -28,6 +28,10 @@ Because `tutorial.open()` returns a Promise, you can keep `<TutorialOverlay />`
 
 The highlight frame uses `options.highLightPadding` to expand around the target. If you do not provide it, the overlay uses an `8px` padding by default.
 
+Visual customization stays global for now. Use `options.overlayColor`, `options.highlightBorderColor`, `options.highlightBorderRadius`, `options.zIndex`, and `options.infoBoxWidth` when you need the built-in overlay UI to better match your product chrome.
+
+Use `options.labels` to replace the built-in `이전`, `다음`, `건너뛰기`, and `완료` button text without replacing the UI itself.
+
 By default, the mounted overlay listens for `Escape`, `ArrowLeft`, and `ArrowRight` while it is open. You can disable that with `options.keyboardNavigation = false`.
 
 Backdrop clicks are ignored by default. Set `options.closeOnOverlayClick = true` if you want clicking the dimmed overlay area to close the tutorial.
diff --git a/packages/document/src/pages/docs/tutorial.mdx b/packages/document/src/pages/docs/tutorial.mdx
index 8a985e5..3ea025e 100644
--- a/packages/document/src/pages/docs/tutorial.mdx
+++ b/packages/document/src/pages/docs/tutorial.mdx
@@ -29,7 +29,18 @@ function App() {
         options: {
           highLightPadding: 12,
           infoBoxHeight: 220,
+          infoBoxWidth: '24rem',
           infoBoxMargin: 24,
+          overlayColor: 'rgba(15, 23, 42, 0.6)',
+          highlightBorderColor: '#22c55e',
+          highlightBorderRadius: 16,
+          zIndex: 3000,
+          labels: {
+            prev: 'Back',
+            next: 'Continue',
+            skip: 'Dismiss',
+            done: 'Finish',
+          },
           keyboardNavigation: true,
           closeOnOverlayClick: true,
         },
@@ -76,7 +87,13 @@ function App() {
 
 - `highLightPadding`: expands the highlight frame around the target in pixels. Defaults to `8`.
 - `infoBoxHeight`: sets the info box height in pixels.
+- `infoBoxWidth`: sets the info box width with a CSS length such as `360` or `'24rem'`. Defaults to `'20rem'`.
 - `infoBoxMargin`: controls the vertical gap between the target and the info box.
+- `overlayColor`: sets the backdrop color. Defaults to `rgba(0, 0, 0, 0.5)`.
+- `highlightBorderColor`: sets the highlight border color. Defaults to `#ff0000`.
+- `highlightBorderRadius`: sets the highlight border radius with a CSS length. Defaults to the current padding-based radius.
+- `zIndex`: sets the overlay stack level. Defaults to `9999`.
+- `labels`: overrides the built-in `prev`, `next`, `skip`, and `done` button labels.
 - `keyboardNavigation`: enables `Escape`, `ArrowLeft`, and `ArrowRight` shortcuts while the overlay is open. Defaults to `true`.
 - `closeOnOverlayClick`: closes the tutorial when the backdrop itself is clicked. Defaults to `false`.
 - `onClose`: runs when the tutorial is closed.
diff --git a/packages/main/src/components/content.tsx b/packages/main/src/components/content.tsx
index a47306a..d232618 100644
--- a/packages/main/src/components/content.tsx
+++ b/packages/main/src/components/content.tsx
@@ -2,15 +2,17 @@ import React, { useId } from 'react';
 import { useTutorialStore } from '../core/store';
 import { skipTutorial, tutorial } from '../core/tutorial';
 import { styled } from 'goober';
+import { DEFAULT_INFO_BOX_WIDTH, INFO_BOX_Z_INDEX_OFFSET, getBaseZIndex, getLabels } from '../core/options';
 
 export const Content = React.forwardRef<HTMLDivElement>((_, ref) => {
   const {
     index,
-    tutorial: { steps },
+    tutorial: { steps, options },
   } = useTutorialStore();
   const currentStep = steps[index];
   const titleId = useId();
   const contentId = useId();
+  const labels = getLabels(options);
 
   const handlePrev = () => {
     tutorial.prev();
@@ -31,11 +33,15 @@ export const Content = React.forwardRef<HTMLDivElement>((_, ref) => {
       aria-labelledby={titleId}
       aria-describedby={currentStep.content ? contentId : undefined}
       tabIndex={-1}
+      style={{
+        width: options?.infoBoxWidth ?? DEFAULT_INFO_BOX_WIDTH,
+        zIndex: getBaseZIndex(options) + INFO_BOX_Z_INDEX_OFFSET,
+      }}
     >
       <Heander>
         <InfoTitle>
           <Title id={titleId}>{currentStep.title}</Title>
-          <button onClick={handleClose}>건너뛰기</button>
+          <button onClick={handleClose}>{labels.skip}</button>
         </InfoTitle>
         <InfoContent id={contentId}>{currentStep.content ?? ''}</InfoContent>
       </Heander>
@@ -44,8 +50,8 @@ export const Content = React.forwardRef<HTMLDivElement>((_, ref) => {
           <span>{`${index + 1} / ${steps.length}`}</span>
         </InfoSteps>
         <ButtonWrapper className="flex gap-[.625rem]">
-          {index !== 0 && <button onClick={handlePrev}>이전</button>}
-          <button onClick={handleNext}>{index === steps.length - 1 ? '완료' : '다음'}</button>
+          {index !== 0 && <button onClick={handlePrev}>{labels.prev}</button>}
+          <button onClick={handleNext}>{index === steps.length - 1 ? labels.done : labels.next}</button>
         </ButtonWrapper>
       </Footer>
     </Wrapper>
@@ -56,7 +62,7 @@ Content.displayName = 'Content';
 const Wrapper = styled('div', React.forwardRef)`
   position: absolute;
   top: 6.25rem;
-  z-index: 999;
+  z-index: 10001;
   width: 20rem;
   min-height: 7.5rem;
   display: flex;
diff --git a/packages/main/src/components/tutorial-overlay.tsx b/packages/main/src/components/tutorial-overlay.tsx
index 81b117b..61bceee 100644
--- a/packages/main/src/components/tutorial-overlay.tsx
+++ b/packages/main/src/components/tutorial-overlay.tsx
@@ -4,10 +4,17 @@ import { useTutorialStore } from '../core/store';
 import { setup, styled } from 'goober';
 import { Content } from './content';
 import { tutorial } from '../core/tutorial';
+import {
+  DEFAULT_HIGHLIGHT_BORDER_COLOR,
+  DEFAULT_HIGHLIGHT_PADDING,
+  DEFAULT_OVERLAY_COLOR,
+  DEFAULT_Z_INDEX,
+  HIGHLIGHT_Z_INDEX_OFFSET,
+  getBaseZIndex,
+} from '../core/options';
 
 setup(React.createElement);
 
-const DEFAULT_HIGHLIGHT_PADDING = 8;
 const MIN_VIEWPORT_OFFSET = 10;
 const FOCUSABLE_SELECTOR = [
   'button:not([disabled])',
@@ -34,6 +41,7 @@ export const TutorialOverlay = React.memo(({}: TutorialOverlayProps) => {
   const previouslyFocusedElement = useRef<HTMLElement | null>(null);
   const wasOpen = useRef(open);
   const timeout = useRef<number | undefined>();
+  const baseZIndex = getBaseZIndex(options);
 
   function shouldIgnoreKeyboardEvent(): boolean {
     const activeElement = document.activeElement;
@@ -284,14 +292,26 @@ export const TutorialOverlay = React.memo(({}: TutorialOverlayProps) => {
   };
 
   return open ? (
-    <Wrapper data-testid="tutorial-overlay-backdrop" onClick={handleBackdropClick}>
+    <Wrapper
+      data-testid="tutorial-overlay-backdrop"
+      onClick={handleBackdropClick}
+      style={{
+        backgroundColor: options?.overlayColor ?? DEFAULT_OVERLAY_COLOR,
+        zIndex: baseZIndex,
+      }}
+    >
       <Content ref={infoBoxElement} />
       {rectStyles.map((style) => (
         <Hightlight
           aria-hidden="true"
           data-testid={`tutorial-overlay-highlight-${style.id}`}
           key={style.id}
-          style={style}
+          style={{
+            ...style,
+            borderColor: options?.highlightBorderColor ?? DEFAULT_HIGHLIGHT_BORDER_COLOR,
+            borderRadius: options?.highlightBorderRadius ?? style.borderRadius,
+            zIndex: baseZIndex + HIGHLIGHT_Z_INDEX_OFFSET,
+          }}
         />
       ))}
     </Wrapper>
@@ -302,16 +322,16 @@ const Wrapper = styled('div')`
   position: fixed;
   top: 0;
   left: 0;
-  z-index: 9999;
+  z-index: ${DEFAULT_Z_INDEX};
   height: 100vh;
   width: 100vw;
-  background-color: rgba(0, 0, 0, 0.5);
+  background-color: ${DEFAULT_OVERLAY_COLOR};
 `;
 
 const Hightlight = styled('div')`
   position: absolute;
-  z-index: 9999;
+  z-index: ${DEFAULT_Z_INDEX + HIGHLIGHT_Z_INDEX_OFFSET};
   box-sizing: border-box;
-  border: 2px solid #ff0000;
+  border: 2px solid ${DEFAULT_HIGHLIGHT_BORDER_COLOR};
   border-radius: 0.625rem;
 `;
diff --git a/packages/main/src/core/options.ts b/packages/main/src/core/options.ts
new file mode 100644
index 0000000..8382276
--- /dev/null
+++ b/packages/main/src/core/options.ts
@@ -0,0 +1,27 @@
+import type { Labels, Options } from './types';
+
+export const DEFAULT_HIGHLIGHT_PADDING = 8;
+export const DEFAULT_OVERLAY_COLOR = 'rgba(0, 0, 0, 0.5)';
+export const DEFAULT_HIGHLIGHT_BORDER_COLOR = '#ff0000';
+export const DEFAULT_INFO_BOX_WIDTH = '20rem';
+export const DEFAULT_Z_INDEX = 9999;
+export const HIGHLIGHT_Z_INDEX_OFFSET = 1;
+export const INFO_BOX_Z_INDEX_OFFSET = 2;
+
+export const DEFAULT_LABELS: Required<Labels> = {
+  prev: '이전',
+  next: '다음',
+  skip: '건너뛰기',
+  done: '완료',
+};
+
+export function getLabels(options?: Options): Required<Labels> {
+  return {
+    ...DEFAULT_LABELS,
+    ...options?.labels,
+  };
+}
+
+export function getBaseZIndex(options?: Options): number {
+  return options?.zIndex ?? DEFAULT_Z_INDEX;
+}
diff --git a/packages/main/src/core/types.ts b/packages/main/src/core/types.ts
index 1eb0b64..e3198d8 100644
--- a/packages/main/src/core/types.ts
+++ b/packages/main/src/core/types.ts
@@ -1,3 +1,5 @@
+export type StyleValue = number | string;
+
 export interface Step {
   targetIds: string[];
   content?: string;
@@ -7,10 +9,23 @@ export interface Step {
   onNextStep?: () => void;
 }
 
+export interface Labels {
+  prev?: string;
+  next?: string;
+  skip?: string;
+  done?: string;
+}
+
 export interface Options {
   highLightPadding?: number;
   infoBoxHeight?: number;
+  infoBoxWidth?: StyleValue;
   infoBoxMargin?: number;
+  overlayColor?: string;
+  highlightBorderColor?: string;
+  highlightBorderRadius?: StyleValue;
+  zIndex?: number;
+  labels?: Labels;
   keyboardNavigation?: boolean;
   closeOnOverlayClick?: boolean;
   onClose?: () => void;
@@ -33,5 +48,5 @@ export interface ElementStyle {
   top: number;
   width: number;
   height: number;
-  borderRadius?: number;
+  borderRadius?: StyleValue;
 }
diff --git a/packages/main/test/content.test.tsx b/packages/main/test/content.test.tsx
index c8ff211..359f8b3 100644
--- a/packages/main/test/content.test.tsx
+++ b/packages/main/test/content.test.tsx
@@ -14,6 +14,35 @@ function renderOverlay() {
 }
 
 describe('Content', () => {
+  test('reads built-in button labels from options.labels', () => {
+    renderOverlay();
+
+    act(() => {
+      tutorial.open({
+        steps: [
+          { title: 'Step 1', content: 'Step 1 content', targetIds: ['first-target'] },
+          { title: 'Step 2', content: 'Step 2 content', targetIds: ['second-target'] },
+        ],
+        options: {
+          labels: {
+            prev: 'Back',
+            next: 'Continue',
+            skip: 'Dismiss',
+            done: 'Finish',
+          },
+        },
+      });
+    });
+
+    expect(screen.getByRole('button', { name: 'Dismiss' })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'Continue' })).toBeInTheDocument();
+
+    fireEvent.click(screen.getByRole('button', { name: 'Continue' }));
+
+    expect(screen.getByRole('button', { name: 'Back' })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'Finish' })).toBeInTheDocument();
+  });
+
   test('button navigation invokes each step callback once', () => {
     const onNextStep = jest.fn();
     const onPrevStep = jest.fn();
diff --git a/packages/main/test/tutorial-overlay.test.tsx b/packages/main/test/tutorial-overlay.test.tsx
index a4e2f81..928a5ee 100644
--- a/packages/main/test/tutorial-overlay.test.tsx
+++ b/packages/main/test/tutorial-overlay.test.tsx
@@ -345,4 +345,31 @@ describe('TutorialOverlay', () => {
 
     jest.useRealTimers();
   });
+
+  test('applies custom overlay, highlight, and info box styles from options', () => {
+    renderOverlay();
+    mockTargetRect('first-target', { left: 120, top: 96, width: 140, height: 48 });
+
+    openTutorial({
+      overlayColor: 'rgba(12, 34, 56, 0.7)',
+      highlightBorderColor: 'rgb(0, 255, 136)',
+      highlightBorderRadius: 24,
+      zIndex: 4321,
+      infoBoxWidth: '28rem',
+    });
+
+    expect(screen.getByTestId('tutorial-overlay-backdrop')).toHaveStyle({
+      backgroundColor: 'rgba(12, 34, 56, 0.7)',
+      zIndex: '4321',
+    });
+    expect(screen.getByRole('dialog', { name: 'Step 1' })).toHaveStyle({
+      width: '28rem',
+      zIndex: '4323',
+    });
+    expect(screen.getByTestId('tutorial-overlay-highlight-first-target')).toHaveStyle({
+      borderColor: 'rgb(0, 255, 136)',
+      borderRadius: '24px',
+      zIndex: '4322',
+    });
+  });
 });