diff --git a/src/components/caret.tsx b/src/components/caret.tsx
index 6a56278..ba2e482 100644
--- a/src/components/caret.tsx
+++ b/src/components/caret.tsx
@@ -1,11 +1,17 @@
 import { useEffect, useRef } from 'react';
-import { StyleSheet, Animated } from 'react-native';
-import { DEFAULT_DARK_COLOR } from '../constants';
+import { StyleSheet, Animated, Platform } from 'react-native';
 import { useTextInputOTP } from '../hooks/use-text-input-otp';
+import { useThemeColor } from '../hooks/use-theme-color';
+import { theme } from '../theme';
 
 export function Caret() {
   const opacity = useRef(new Animated.Value(0)).current;
+  const useNativeDriver = Platform.OS === 'ios' || Platform.OS === 'android';
   const { caretColor } = useTextInputOTP();
+  const defaultBackgroundColor = useThemeColor({
+    light: theme.colorBlack,
+    dark: theme.colorWhite,
+  });
 
   useEffect(() => {
     Animated.loop(
@@ -13,12 +19,12 @@ export function Caret() {
         Animated.timing(opacity, {
           toValue: 0,
           duration: 500,
-          useNativeDriver: true,
+          useNativeDriver: false,
         }),
         Animated.timing(opacity, {
           toValue: 1,
           duration: 500,
-          useNativeDriver: true,
+          useNativeDriver,
         }),
       ])
     ).start();
@@ -29,7 +35,7 @@ export function Caret() {
       testID="caret"
       style={[
         styles.caret,
-        { opacity, backgroundColor: caretColor ?? DEFAULT_DARK_COLOR },
+        { opacity, backgroundColor: caretColor ?? defaultBackgroundColor },
       ]}
     />
   );
@@ -37,8 +43,8 @@ export function Caret() {
 
 const styles = StyleSheet.create({
   caret: {
-    width: 2,
-    height: 16,
-    borderRadius: 16,
+    width: theme.space2,
+    height: theme.space16,
+    borderRadius: theme.borderRadius16,
   },
 });
diff --git a/src/components/text-input-otp-separator.tsx b/src/components/text-input-otp-separator.tsx
index ade0d62..b0b06d2 100644
--- a/src/components/text-input-otp-separator.tsx
+++ b/src/components/text-input-otp-separator.tsx
@@ -1,20 +1,31 @@
 import { View, StyleSheet } from 'react-native';
-import { DEFAULT_DARK_COLOR } from '../constants';
 import type { TextInputOTPSeparatorProps } from '../types';
+import { useThemeColor } from '../hooks/use-theme-color';
+import { theme } from '../theme';
 
 export function TextInputOTPSeparator({
   separatorStyles,
 }: TextInputOTPSeparatorProps) {
+  const defaultBackgroundColor = useThemeColor({
+    light: theme.colorBlack,
+    dark: theme.colorWhite,
+  });
+
   return (
-    <View style={StyleSheet.flatten([styles.separator, separatorStyles])} />
+    <View
+      style={StyleSheet.flatten([
+        styles.separator,
+        { backgroundColor: defaultBackgroundColor },
+        separatorStyles,
+      ])}
+    />
   );
 }
 
 const styles = StyleSheet.create({
   separator: {
-    width: 10,
-    height: 4,
-    backgroundColor: DEFAULT_DARK_COLOR,
-    borderRadius: 15,
+    width: theme.space10,
+    height: theme.space4,
+    borderRadius: theme.space16,
   },
 });
diff --git a/src/components/text-input-otp-slot.tsx b/src/components/text-input-otp-slot.tsx
index 00a8054..d0622f8 100644
--- a/src/components/text-input-otp-slot.tsx
+++ b/src/components/text-input-otp-slot.tsx
@@ -1,13 +1,15 @@
 import { memo } from 'react';
 import { Pressable, Text, StyleSheet } from 'react-native';
-import { Caret } from './caret';
 import { useTextInputOTP } from '../hooks/use-text-input-otp';
 import { useSlotBorderStyles } from '../hooks/use-slot-border-styles';
-import { DEFAULT_DARK_COLOR, SLOT_HEIGHT, SLOT_WIDTH } from '../constants';
+import { useThemeColor } from '../hooks/use-theme-color';
+import { SLOT_HEIGHT, SLOT_WIDTH } from '../constants';
 import type {
   TextInputOTPSlotInternalProps,
   TextInputOTPSlotProps,
 } from '../types';
+import { theme } from '../theme';
+import { Caret } from './caret';
 
 function TextInputOTPSlotComponent({
   index,
@@ -22,6 +24,11 @@ function TextInputOTPSlotComponent({
   const { code, currentIndex, handlePress, caretHidden } = useTextInputOTP();
   const isFocused = currentIndex === index;
   const borderStyles = useSlotBorderStyles({ isFocused, isFirst, isLast });
+  const defaultTextColor = useThemeColor({
+    light: theme.colorBlack,
+    dark: theme.colorWhite,
+  });
+
   const shouldRenderCaret = isFocused && !code[index] && !caretHidden;
 
   return (
@@ -39,6 +46,7 @@ function TextInputOTPSlotComponent({
         <Text
           style={StyleSheet.flatten([
             styles.slotText,
+            { color: defaultTextColor },
             isFocused ? focusedSlotTextStyles : slotTextStyles,
           ])}
         >
@@ -61,8 +69,7 @@ const styles = StyleSheet.create({
     alignItems: 'center',
   },
   slotText: {
-    color: DEFAULT_DARK_COLOR,
-    fontSize: 14,
-    fontWeight: 'bold',
+    fontSize: theme.fontSize14,
+    fontWeight: theme.fontWeightBold,
   },
 });
diff --git a/src/components/text-input-otp.tsx b/src/components/text-input-otp.tsx
index d8679b3..4ea3dd7 100644
--- a/src/components/text-input-otp.tsx
+++ b/src/components/text-input-otp.tsx
@@ -1,8 +1,9 @@
+import { forwardRef } from 'react';
 import { View, StyleSheet } from 'react-native';
 import { TextInputOTPProvider } from '../hooks/use-text-input-otp';
-import { TextInput } from './text-input';
-import { forwardRef } from 'react';
 import type { TextInputOTPProps, TextInputOTPRef } from '../types';
+import { theme } from '../theme';
+import { TextInput } from './text-input';
 
 export const TextInputOTP = forwardRef<TextInputOTPRef, TextInputOTPProps>(
   ({ children, containerStyles, ...rest }, ref) => {
@@ -22,6 +23,6 @@ const styles = StyleSheet.create({
     flexDirection: 'row',
     alignItems: 'center',
     justifyContent: 'center',
-    gap: 10,
+    gap: theme.space10,
   },
 });
diff --git a/src/constants.ts b/src/constants.ts
index b22701d..96b8c3f 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -1,5 +1,3 @@
 export const SLOT_WIDTH = 50;
 export const SLOT_HEIGHT = 50;
 export const FOCUSED_SLOT_HEIGHT = 54;
-export const DEFAULT_DARK_COLOR = '#030712';
-export const DEFAULT_LIGHT_COLOR = '#E4E7EC';
diff --git a/src/hooks/use-slot-border-styles.ts b/src/hooks/use-slot-border-styles.ts
index a8c3d11..fe739be 100644
--- a/src/hooks/use-slot-border-styles.ts
+++ b/src/hooks/use-slot-border-styles.ts
@@ -1,26 +1,33 @@
-import {
-  DEFAULT_DARK_COLOR,
-  DEFAULT_LIGHT_COLOR,
-  FOCUSED_SLOT_HEIGHT,
-  SLOT_HEIGHT,
-} from '../constants';
+import type { StyleProp, ViewStyle } from 'react-native';
+import { FOCUSED_SLOT_HEIGHT, SLOT_HEIGHT } from '../constants';
+import { theme } from '../theme';
 import type { UseSlotBorderStylesProps } from '../types';
+import { useThemeColor } from './use-theme-color';
 
 export function useSlotBorderStyles({
   isFocused,
   isFirst,
   isLast,
-}: UseSlotBorderStylesProps) {
+}: UseSlotBorderStylesProps): StyleProp<ViewStyle> {
+  const darkBorder = useThemeColor({
+    light: theme.colorBlack,
+    dark: theme.colorWhite,
+  });
+  const lightBorder = useThemeColor({
+    light: theme.colorLightGrey,
+    dark: theme.colorDarkGrey,
+  });
+
   return {
     height: isFocused ? FOCUSED_SLOT_HEIGHT : SLOT_HEIGHT,
-    borderColor: isFocused ? DEFAULT_DARK_COLOR : DEFAULT_LIGHT_COLOR,
-    borderTopWidth: 2,
-    borderBottomWidth: 2,
-    borderLeftWidth: isFocused || isFirst ? 2 : 1,
-    borderRightWidth: isFocused || isLast ? 2 : 1,
-    borderTopLeftRadius: isFirst ? 8 : 0,
-    borderTopRightRadius: isLast ? 8 : 0,
-    borderBottomLeftRadius: isFirst ? 8 : 0,
-    borderBottomRightRadius: isLast ? 8 : 0,
+    borderColor: isFocused ? darkBorder : lightBorder,
+    borderTopWidth: theme.space2,
+    borderBottomWidth: theme.space2,
+    borderLeftWidth: isFocused || isFirst ? theme.space2 : theme.space1,
+    borderRightWidth: isFocused || isLast ? theme.space2 : theme.space1,
+    borderTopLeftRadius: isFirst ? theme.borderRadius8 : theme.borderRadius0,
+    borderTopRightRadius: isLast ? theme.borderRadius8 : theme.borderRadius0,
+    borderBottomLeftRadius: isFirst ? theme.borderRadius8 : theme.borderRadius0,
+    borderBottomRightRadius: isLast ? theme.borderRadius8 : theme.borderRadius0,
   };
 }
diff --git a/src/hooks/use-theme-color.ts b/src/hooks/use-theme-color.ts
new file mode 100644
index 0000000..e34d4aa
--- /dev/null
+++ b/src/hooks/use-theme-color.ts
@@ -0,0 +1,6 @@
+import { useColorScheme } from 'react-native';
+
+export function useThemeColor<T, U>(props: { light: T; dark: U }) {
+  const theme = useColorScheme() ?? 'light';
+  return props[theme];
+}
diff --git a/src/theme.ts b/src/theme.ts
new file mode 100644
index 0000000..8b3bac8
--- /dev/null
+++ b/src/theme.ts
@@ -0,0 +1,20 @@
+export const theme = {
+  colorBlack: '#030712',
+  colorWhite: '#E4E7EC',
+  colorLightGrey: '#E4E7EC',
+  colorDarkGrey: '#4b5563',
+
+  fontSize14: 14,
+
+  fontWeightBold: 'bold' as 'bold',
+
+  space1: 1,
+  space2: 2,
+  space4: 4,
+  space10: 10,
+  space16: 16,
+
+  borderRadius0: 0,
+  borderRadius8: 8,
+  borderRadius16: 16,
+};