diff --git a/__test__/components/DuplicateEvent.test.tsx b/__test__/components/DuplicateEvent.test.tsx
index f3c0066..91b3165 100644
--- a/__test__/components/DuplicateEvent.test.tsx
+++ b/__test__/components/DuplicateEvent.test.tsx
@@ -62,8 +62,9 @@ const preloadedState = {
 };
 
 describe("EventDuplication", () => {
-  it("opens EventPopover when button clicked", () => {
+  it("calls onOpenDuplicate when button clicked", () => {
     const handleClose = jest.fn();
+    const onOpenDuplicate = jest.fn();
     renderWithProviders(
       <EventDuplication
         event={
@@ -71,36 +72,14 @@ describe("EventDuplication", () => {
             .event1
         }
         onClose={handleClose}
+        onOpenDuplicate={onOpenDuplicate}
       />,
       preloadedState
     );
 
     fireEvent.click(screen.getByRole("menuitem", { name: /Duplicate event/i }));
 
-    expect(screen.getAllByText(/Duplicate Event/i)[1]).toBeInTheDocument();
-  });
-
-  it("calls onClose when closing the popover", () => {
-    const handleClose = jest.fn();
-    renderWithProviders(
-      <EventDuplication
-        event={
-          preloadedState.calendars.list["667037022b752d0026472254/cal1"].events
-            .event1
-        }
-        onClose={handleClose}
-      />,
-      preloadedState
-    );
-
-    fireEvent.click(screen.getByRole("menuitem", { name: /Duplicate event/i }));
-
-    // Cancel button only appears in expanded mode
-    fireEvent.click(screen.getByRole("button", { name: /More options/i }));
-
-    fireEvent.click(screen.getByRole("button", { name: /Cancel/i }));
-
-    expect(handleClose).toHaveBeenCalled();
+    expect(onOpenDuplicate).toHaveBeenCalled();
   });
 });
 
diff --git a/src/App.tsx b/src/App.tsx
index 28485a9..955f7fe 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -8,18 +8,22 @@ import { Loading } from "./components/Loading/Loading";
 import HandleLogin from "./features/User/HandleLogin";
 import CalendarLayout from "./components/Calendar/CalendarLayout";
 import { Error } from "./components/Error/Error";
+import { CustomThemeProvider } from "./theme/ThemeProvider";
+
 function App() {
   return (
-    <Suspense fallback={<Loading />}>
-      <Router history={history}>
-        <Routes>
-          <Route path="/" element={<HandleLogin />} />
-          <Route path="/calendar" element={<CalendarLayout />} />
-          <Route path="/callback" element={<CallbackResume />} />
-          <Route path="/error" element={<Error />} />
-        </Routes>
-      </Router>
-    </Suspense>
+    <CustomThemeProvider>
+      <Suspense fallback={<Loading />}>
+        <Router history={history}>
+          <Routes>
+            <Route path="/" element={<HandleLogin />} />
+            <Route path="/calendar" element={<CalendarLayout />} />
+            <Route path="/callback" element={<CallbackResume />} />
+            <Route path="/error" element={<Error />} />
+          </Routes>
+        </Router>
+      </Suspense>
+    </CustomThemeProvider>
   );
 }
 
diff --git a/src/components/Calendar/TimezoneSelector.tsx b/src/components/Calendar/TimezoneSelector.tsx
index e7580f2..8378c53 100644
--- a/src/components/Calendar/TimezoneSelector.tsx
+++ b/src/components/Calendar/TimezoneSelector.tsx
@@ -66,17 +66,19 @@ export function TimezoneSelector({ value, onChange }: TimezoneSelectProps) {
         }}
         slotProps={{
           paper: {
-            sx: { width: 280, maxHeight: 400, overflow: "auto", p: 1 },
+            sx: { width: 280, maxHeight: 400, overflow: "hidden", p: 0 },
           },
         }}
       >
         <TimezoneAutocomplete
+          size="medium"
           value={effectiveTimezone}
           onChange={onChange}
           zones={timezoneList.zones}
           getTimezoneOffset={getTimezoneOffset}
           autoFocus={true}
-          inputFontSize="10px"
+          showIcon={true}
+          inputFontSize="14px"
           inputPadding="2px 4px"
           onClose={handleClose}
           disableClearable={true}
diff --git a/src/components/Dialog/ResponsiveDialog.tsx b/src/components/Dialog/ResponsiveDialog.tsx
index c1477d9..1b58c84 100644
--- a/src/components/Dialog/ResponsiveDialog.tsx
+++ b/src/components/Dialog/ResponsiveDialog.tsx
@@ -78,6 +78,14 @@ interface ResponsiveDialogProps
   dividers?: boolean;
   /** Whether to show header action icons (expand/close) in normal mode (default: true) */
   showHeaderActions?: boolean;
+  /** Whether to add border-top to DialogActions */
+  actionsBorderTop?: boolean;
+  /** Justify content alignment for DialogActions */
+  actionsJustifyContent?:
+    | "flex-start"
+    | "center"
+    | "flex-end"
+    | "space-between";
 }
 
 function ResponsiveDialog({
@@ -99,6 +107,8 @@ function ResponsiveDialog({
   dialogTitleProps,
   dividers = false,
   showHeaderActions = true,
+  actionsBorderTop = false,
+  actionsJustifyContent = "flex-end",
   sx,
   ...otherDialogProps
 }: ResponsiveDialogProps) {
@@ -199,7 +209,20 @@ function ResponsiveDialog({
           <Stack spacing={currentSpacing}>{children}</Stack>
         )}
       </DialogContent>
-      {actions && <DialogActions>{actions}</DialogActions>}
+      {actions && (
+        <DialogActions
+          sx={{
+            borderTop: actionsBorderTop
+              ? (theme) => `1px solid ${theme.palette.divider}`
+              : undefined,
+            justifyContent: actionsJustifyContent,
+            paddingTop: "18px",
+            paddingBottom: "18px",
+          }}
+        >
+          {actions}
+        </DialogActions>
+      )}
     </Dialog>
   );
 }
diff --git a/src/components/Event/EventDuplicate.tsx b/src/components/Event/EventDuplicate.tsx
index 826cb67..468f09e 100644
--- a/src/components/Event/EventDuplicate.tsx
+++ b/src/components/Event/EventDuplicate.tsx
@@ -1,51 +1,22 @@
-import { IconButton, MenuItem } from "@mui/material";
+import { MenuItem } from "@mui/material";
 import { CalendarEvent } from "../../features/Events/EventsTypes";
-import AddToPhotosIcon from "@mui/icons-material/AddToPhotos";
-import { useRef, useState } from "react";
-import EventPopover from "../../features/Events/EventModal";
-import { CalendarApi, DateSelectArg } from "@fullcalendar/core";
 
 export default function EventDuplication({
   onClose,
   event,
+  onOpenDuplicate,
 }: {
   onClose: Function;
   event: CalendarEvent;
+  onOpenDuplicate?: () => void;
 }) {
-  const [openModal, setOpenModal] = useState(false);
-  const [selectedRange, setSelectedRange] = useState<DateSelectArg | null>({
-    start: new Date(event.start),
-    startStr: event.start,
-    end: new Date(event.end ?? ""),
-    endStr: event.end ?? "",
-    allDay: event.allday ?? false,
-  } as DateSelectArg);
-  const calendarRef = useRef<CalendarApi | null>(null);
-
-  const handleClosePopover = () => {
-    calendarRef.current?.unselect();
-    setSelectedRange(null);
-    setOpenModal(!openModal);
-    onClose({}, "backdropClick");
-  };
   return (
-    <>
-      <MenuItem
-        onClick={() => {
-          setOpenModal(true);
-        }}
-      >
-        Duplicate event
-      </MenuItem>
-      <EventPopover
-        anchorEl={null}
-        open={openModal}
-        selectedRange={selectedRange}
-        setSelectedRange={setSelectedRange}
-        calendarRef={calendarRef}
-        onClose={handleClosePopover}
-        event={event}
-      />
-    </>
+    <MenuItem
+      onClick={() => {
+        onOpenDuplicate?.();
+      }}
+    >
+      Duplicate event
+    </MenuItem>
   );
 }
diff --git a/src/components/Event/InfoRow.tsx b/src/components/Event/InfoRow.tsx
index 25195b5..5695f1b 100644
--- a/src/components/Event/InfoRow.tsx
+++ b/src/components/Event/InfoRow.tsx
@@ -77,12 +77,14 @@ export function InfoRow({
         <Typography
           variant="body2"
           color={error ? "error" : "textPrimary"}
-          style={{
+          sx={{
             wordBreak: "break-word",
             whiteSpace: "pre-line",
             maxHeight: "33vh",
             overflowY: "auto",
             width: "100%",
+            fontSize: "16px",
+            fontFamily: "'Inter', sans-serif",
           }}
         >
           {data ? (
diff --git a/src/components/Event/utils/eventUtils.tsx b/src/components/Event/utils/eventUtils.tsx
index ea5805b..2161973 100644
--- a/src/components/Event/utils/eventUtils.tsx
+++ b/src/components/Event/utils/eventUtils.tsx
@@ -44,6 +44,7 @@ export function renderAttendeeBadge(
       >
         <Badge
           overlap="circular"
+          sx={{ marginRight: 2 }}
           anchorOrigin={{ vertical: "bottom", horizontal: "right" }}
           badgeContent={
             classIcon && (
@@ -65,7 +66,6 @@ export function renderAttendeeBadge(
         </Badge>
         <Box style={{ display: "flex", flexDirection: "column", minWidth: 0 }}>
           <Typography
-            variant="body2"
             noWrap
             style={{
               maxWidth: "180px",
@@ -76,11 +76,7 @@ export function renderAttendeeBadge(
             {a.cn || a.cal_address}
           </Typography>
           {isOrganizer && (
-            <Typography
-              variant="caption"
-              color="text.secondary"
-              style={{ fontStyle: "italic" }}
-            >
+            <Typography variant="caption" color="text.secondary">
               Organizer
             </Typography>
           )}
diff --git a/src/features/Events/EventDisplayPreview.tsx b/src/features/Events/EventDisplayPreview.tsx
index 28b987f..8031614 100644
--- a/src/features/Events/EventDisplayPreview.tsx
+++ b/src/features/Events/EventDisplayPreview.tsx
@@ -12,13 +12,13 @@ import SubjectIcon from "@mui/icons-material/Subject";
 import VideocamIcon from "@mui/icons-material/Videocam";
 import RepeatIcon from "@mui/icons-material/Repeat";
 import LockOutlineIcon from "@mui/icons-material/LockOutline";
+import EventPopover from "./EventModal";
+import { DateSelectArg } from "@fullcalendar/core";
 import {
   Box,
   Button,
-  ButtonGroup,
   Chip,
   DialogActions,
-  Divider,
   IconButton,
   Menu,
   MenuItem,
@@ -77,6 +77,7 @@ export default function EventPreviewModal({
   const [showAllAttendees, setShowAllAttendees] = useState(false);
   const [openFullDisplay, setOpenFullDisplay] = useState(false);
   const [openUpdateModal, setOpenUpdateModal] = useState(false);
+  const [openDuplicateModal, setOpenDuplicateModal] = useState(false);
   const [hidePreview, setHidePreview] = useState(false);
   const [openEditModePopup, setOpenEditModePopup] = useState<string | null>(
     null
@@ -136,6 +137,8 @@ export default function EventPreviewModal({
         open={open && !hidePreview}
         onClose={() => onClose({}, "backdropClick")}
         showHeaderActions={false}
+        actionsBorderTop={true}
+        actionsJustifyContent="center"
         style={{ overflow: "auto" }}
         title={
           event.title && (
@@ -210,7 +213,15 @@ export default function EventPreviewModal({
                         Email attendees
                       </MenuItem>
                     )}
-                    <EventDuplication event={event} onClose={onClose} />
+                    <EventDuplication
+                      event={event}
+                      onClose={() => setToggleActionMenu(null)}
+                      onOpenDuplicate={() => {
+                        setToggleActionMenu(null);
+                        setHidePreview(true);
+                        setOpenDuplicateModal(true);
+                      }}
+                    />
                     {user.userData.email === event.organizer?.cal_address && (
                       <MenuItem
                         onClick={async () => {
@@ -270,10 +281,12 @@ export default function EventPreviewModal({
                     <LockOutlineIcon />
                   ))}
                 <Typography
-                  variant="inherit"
-                  fontWeight="bold"
-                  style={{
+                  variant="h5"
+                  sx={{
+                    fontSize: "24px",
+                    fontWeight: 600,
                     wordBreak: "break-word",
+                    fontFamily: "Inter, sans-serif",
                   }}
                   gutterBottom
                 >
@@ -293,7 +306,7 @@ export default function EventPreviewModal({
                   </Tooltip>
                 )}
               </Box>
-              <Typography variant="body2" color="textSecondary" gutterBottom>
+              <Typography color="text.secondaryContainer" gutterBottom>
                 {formatDate(event.start, event.allday)}
                 {event.end &&
                   formatEnd(event.start, event.end, event.allday) &&
@@ -305,15 +318,22 @@ export default function EventPreviewModal({
         actions={
           <>
             {currentUserAttendee && (
-              <Box style={{ display: "flex", flexDirection: "row" }}>
-                <Typography variant="body2">Attending?</Typography>
-                <ButtonGroup size="small" fullWidth>
+              <>
+                <Typography sx={{ marginRight: 2 }}>Attending?</Typography>
+                <Box display="flex" gap="15px" alignItems="center">
                   <Button
+                    variant={
+                      currentUserAttendee?.partstat === "ACCEPTED"
+                        ? "contained"
+                        : "outlined"
+                    }
                     color={
                       currentUserAttendee?.partstat === "ACCEPTED"
                         ? "success"
                         : "primary"
                     }
+                    size="large"
+                    sx={{ borderRadius: "50px" }}
                     onClick={() => {
                       if (isRecurring) {
                         setAfterChoiceFunc(
@@ -346,11 +366,18 @@ export default function EventPreviewModal({
                     Accept
                   </Button>
                   <Button
+                    variant={
+                      currentUserAttendee?.partstat === "TENTATIVE"
+                        ? "contained"
+                        : "outlined"
+                    }
                     color={
                       currentUserAttendee?.partstat === "TENTATIVE"
                         ? "warning"
                         : "primary"
                     }
+                    size="large"
+                    sx={{ borderRadius: "50px" }}
                     onClick={() => {
                       if (isRecurring) {
                         setAfterChoiceFunc(
@@ -382,11 +409,18 @@ export default function EventPreviewModal({
                     Maybe
                   </Button>
                   <Button
+                    variant={
+                      currentUserAttendee?.partstat === "DECLINED"
+                        ? "contained"
+                        : "outlined"
+                    }
                     color={
                       currentUserAttendee?.partstat === "DECLINED"
                         ? "error"
                         : "primary"
                     }
+                    size="large"
+                    sx={{ borderRadius: "50px" }}
                     onClick={() => {
                       if (isRecurring) {
                         setAfterChoiceFunc(
@@ -417,8 +451,8 @@ export default function EventPreviewModal({
                   >
                     Decline
                   </Button>
-                </ButtonGroup>
-              </Box>
+                </Box>
+              </>
             )}
           </>
         }
@@ -428,7 +462,11 @@ export default function EventPreviewModal({
             {/* Video */}
             {event.x_openpass_videoconference && (
               <InfoRow
-                icon={<VideocamIcon style={{ fontSize: 18 }} />}
+                icon={
+                  <Box sx={{ minWidth: "25px", marginRight: 2 }}>
+                    <VideocamIcon />
+                  </Box>
+                }
                 content={
                   <Button
                     variant="contained"
@@ -445,7 +483,11 @@ export default function EventPreviewModal({
             {attendees?.length > 0 && (
               <>
                 <InfoRow
-                  icon={<PeopleAltOutlinedIcon />}
+                  icon={
+                    <Box sx={{ minWidth: "25px", marginRight: 2 }}>
+                      <PeopleAltOutlinedIcon />
+                    </Box>
+                  }
                   content={
                     <Box
                       style={{
@@ -454,9 +496,11 @@ export default function EventPreviewModal({
                         flexDirection: "row",
                       }}
                     >
-                      <Box>
+                      <Box sx={{ marginRight: 2 }}>
                         <Typography>{attendees.length} guests</Typography>
-                        <Typography>
+                        <Typography
+                          sx={{ fontSize: "13px", color: "text.secondary" }}
+                        >
                           {
                             attendees.filter((a) => a.partstat === "ACCEPTED")
                               .length
@@ -488,9 +532,13 @@ export default function EventPreviewModal({
                         </AvatarGroup>
                       )}
                       <Typography
-                        variant="body2"
-                        color="primary"
-                        style={{ cursor: "pointer", marginTop: 0.5 }}
+                        sx={{
+                          cursor: "pointer",
+                          marginLeft: 2,
+                          fontSize: "14px",
+                          color: "text.secondary",
+                          alignSelf: "center",
+                        }}
                         onClick={() => setShowAllAttendees(!showAllAttendees)}
                       >
                         {showAllAttendees ? "Show less" : `Show more `}
@@ -510,25 +558,44 @@ export default function EventPreviewModal({
             {/* Location */}
             {event.location && (
               <InfoRow
-                icon={<LocationOnOutlinedIcon />}
+                icon={
+                  <Box sx={{ minWidth: "25px", marginRight: 2 }}>
+                    <LocationOnOutlinedIcon />
+                  </Box>
+                }
                 text={event.location}
               />
             )}
             {/* Description */}
             {event.description && (
-              <InfoRow icon={<SubjectIcon />} text={event.description} />
+              <InfoRow
+                icon={
+                  <Box sx={{ minWidth: "25px", marginRight: 2 }}>
+                    <SubjectIcon />
+                  </Box>
+                }
+                text={event.description}
+              />
             )}
             {/* ALARM */}
             {event.alarm && (
               <InfoRow
-                icon={<NotificationsNoneIcon />}
+                icon={
+                  <Box sx={{ minWidth: "25px", marginRight: 2 }}>
+                    <NotificationsNoneIcon />
+                  </Box>
+                }
                 text={`${event.alarm.trigger} before by ${event.alarm.action}`}
               />
             )}
             {/* Repetition */}
             {event.repetition && (
               <InfoRow
-                icon={<RepeatIcon />}
+                icon={
+                  <Box sx={{ minWidth: "25px", marginRight: 2 }}>
+                    <RepeatIcon />
+                  </Box>
+                }
                 text={makeRecurrenceString(event)}
               />
             )}
@@ -560,7 +627,11 @@ export default function EventPreviewModal({
         {/* Error */}
         {event.error && (
           <InfoRow
-            icon={<ErrorOutlineIcon color="error" style={{ fontSize: 18 }} />}
+            icon={
+              <Box sx={{ minWidth: "25px", marginRight: 2 }}>
+                <ErrorOutlineIcon color="error" />
+              </Box>
+            }
             text={event.error}
             error
           />
@@ -574,7 +645,9 @@ export default function EventPreviewModal({
             marginBottom: 2,
           }}
         >
-          <CalendarTodayIcon style={{ fontSize: 16 }} />
+          <Box sx={{ minWidth: "25px", marginRight: 2 }}>
+            <CalendarTodayIcon />
+          </Box>
           <CircleIcon
             style={{
               color: calendar.color?.light ?? "#3788D8",
@@ -582,13 +655,8 @@ export default function EventPreviewModal({
               height: 12,
             }}
           />
-          <Typography variant="body2">{calendar.name}</Typography>
+          <Typography>{calendar.name}</Typography>
         </Box>
-        {currentUserAttendee && !event.repetition && (
-          <>
-            <Divider variant="fullWidth" />
-          </>
-        )}
       </ResponsiveDialog>
       <EditModeDialog
         type={openEditModePopup}
@@ -620,6 +688,26 @@ export default function EventPreviewModal({
         calId={calId}
         typeOfAction={typeOfAction}
       />
+      <EventPopover
+        anchorEl={null}
+        open={openDuplicateModal}
+        selectedRange={
+          {
+            start: new Date(event.start),
+            startStr: event.start,
+            end: new Date(event.end ?? ""),
+            endStr: event.end ?? "",
+            allDay: event.allday ?? false,
+          } as DateSelectArg
+        }
+        setSelectedRange={() => {}}
+        calendarRef={{ current: null }}
+        onClose={() => {
+          setOpenDuplicateModal(false);
+          onClose({}, "backdropClick"); // Đóng cả preview modal
+        }}
+        event={event}
+      />
     </>
   );
 }
diff --git a/src/features/Events/EventModal.tsx b/src/features/Events/EventModal.tsx
index 7a74f44..c223978 100644
--- a/src/features/Events/EventModal.tsx
+++ b/src/features/Events/EventModal.tsx
@@ -104,7 +104,7 @@ function EventPopover({
   );
   const [attendees, setAttendees] = useState<userAttendee[]>(
     event?.attendee
-      ? event.attendee.filter((a) => a.cal_address !== organizer.cal_address)
+      ? event.attendee.filter((a) => a.cal_address !== organizer?.cal_address)
       : []
   );
   const [alarm, setAlarm] = useState(event?.alarm?.trigger ?? "");
@@ -482,8 +482,8 @@ function EventPopover({
       timezone,
       attendee: [
         {
-          cn: organizer.cn,
-          cal_address: organizer.cal_address,
+          cn: organizer?.cn ?? "",
+          cal_address: organizer?.cal_address ?? "",
           partstat: "ACCEPTED",
           rsvp: "FALSE",
           role: "CHAIR",
diff --git a/src/theme/README.md b/src/theme/README.md
new file mode 100644
index 0000000..c45e6f5
--- /dev/null
+++ b/src/theme/README.md
@@ -0,0 +1,118 @@
+# Custom MUI Theme
+
+## Overview
+
+This project uses a custom MUI theme to customize Typography, colors and components according to Twake Calendar design.
+
+## File Structure
+
+```
+src/theme/
+├── theme.ts          # Custom theme definition
+├── ThemeProvider.tsx # ThemeProvider wrapper
+└── README.md         # This documentation
+```
+
+## Custom Theme Features
+
+### Colors
+
+- **Text Primary**: `#000000` (Black)
+- **Text Secondary**: `#717D96` (Custom gray)
+- **Text Secondary Container**: `#243B55` (Dark gray)
+
+### Typography
+
+- **Caption**: fontSize 13px, color `#717D96`
+
+### Components
+
+- **Typography**: Custom styled caption variant
+
+## Usage
+
+### Using CustomThemeProvider
+
+Import and use `CustomThemeProvider` to wrap your application:
+
+```tsx
+import { CustomThemeProvider } from "./theme/ThemeProvider";
+
+function App() {
+  return <CustomThemeProvider>{/* Your application */}</CustomThemeProvider>;
+}
+```
+
+### Accessing the Theme
+
+Use `useTheme` to access theme variables:
+
+```tsx
+import { useTheme } from "@mui/material/styles";
+
+function MyComponent() {
+  const theme = useTheme();
+  const textColor = theme.palette.text.secondary;
+}
+```
+
+### CSS Variables
+
+Use theme variables directly in CSS:
+
+```tsx
+<Typography sx={{ color: "text.secondary" }}>
+  Text with secondary color
+</Typography>
+```
+
+### Typography
+
+Use predefined typography variants:
+
+```tsx
+<Typography variant="caption">Caption text</Typography>
+```
+
+### Customizing Styles
+
+Modify styles in `theme.ts` to customize components:
+
+```typescript
+components: {
+  MuiTypography: {
+    styleOverrides: {
+      caption: {
+        fontSize: "13px",
+        color: "#717D96",
+      },
+    },
+  },
+}
+```
+
+## Migration to Cozy UI
+
+### Installation
+
+```bash
+npm install cozy-ui
+```
+
+### Replacing ThemeProvider
+
+In your main file, replace `CustomThemeProvider` with `MuiCozyTheme`:
+
+```tsx
+import { MuiCozyTheme } from "cozy-ui/React/MuiCozyTheme";
+
+<MuiCozyTheme>{children}</MuiCozyTheme>;
+```
+
+### Updating Palette
+
+Adapt the color palette in `theme.ts` to use Cozy UI colors. Cozy UI provides its own colors that can be integrated into the theme configuration.
+
+### Component Migration
+
+Update components to use Cozy UI components instead of standard MUI components, following Cozy UI documentation for specific components.
diff --git a/src/theme/ThemeProvider.tsx b/src/theme/ThemeProvider.tsx
new file mode 100644
index 0000000..cad62ff
--- /dev/null
+++ b/src/theme/ThemeProvider.tsx
@@ -0,0 +1,19 @@
+import React from "react";
+import { ThemeProvider } from "@mui/material/styles";
+import { CssBaseline } from "@mui/material";
+import { customTheme } from "./theme";
+
+interface CustomThemeProviderProps {
+  children: React.ReactNode;
+}
+
+export function CustomThemeProvider({ children }: CustomThemeProviderProps) {
+  return (
+    <ThemeProvider theme={customTheme}>
+      <CssBaseline />
+      {children}
+    </ThemeProvider>
+  );
+}
+
+export { customTheme };
diff --git a/src/theme/theme.ts b/src/theme/theme.ts
new file mode 100644
index 0000000..fd23305
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+++ b/src/theme/theme.ts
@@ -0,0 +1,38 @@
+import { createTheme } from "@mui/material/styles";
+
+// Custom theme for Twake Calendar
+export const customTheme = createTheme({
+  palette: {
+    text: {
+      primary: "#000000",
+      secondary: "#717D96",
+      secondaryContainer: "#243B55",
+    },
+  },
+  typography: {
+    caption: {
+      fontSize: "0.75rem",
+      fontWeight: 400,
+      lineHeight: 1.4,
+      color: "#8C9CAF", // Custom secondary text color
+    },
+  },
+  components: {
+    // Custom Typography component
+    MuiTypography: {
+      styleOverrides: {
+        // Custom variant for event info text
+        caption: {
+          fontSize: "13px",
+          color: "#717D96",
+        },
+      },
+    },
+    // Custom Button component
+    // Custom Dialog component
+    // Custom DialogActions component
+  },
+});
+
+// Export theme type for TypeScript
+export type CustomTheme = typeof customTheme;