diff --git a/web/src/components/ActivityCalendar.tsx b/web/src/components/ActivityCalendar.tsx
index 7dcdd00c..b41810bd 100644
--- a/web/src/components/ActivityCalendar.tsx
+++ b/web/src/components/ActivityCalendar.tsx
@@ -5,10 +5,10 @@ import { useWorkspaceSettingStore } from "@/store/v1";
 import { WorkspaceGeneralSetting } from "@/types/proto/api/v1/workspace_setting_service";
 import { WorkspaceSettingKey } from "@/types/proto/store/workspace_setting";
 import { useTranslate } from "@/utils/i18n";
+import { cn } from "@/utils/utils";
 
 interface Props {
-  // Format: 2021-1
-  month: string;
+  month: string; // Format: 2021-1
   selectedDate: string;
   data: Record<string, number>;
   onClick?: (date: string) => void;
@@ -16,9 +16,8 @@ interface Props {
 
 const getCellAdditionalStyles = (count: number, maxCount: number) => {
   if (count === 0) {
-    return "bg-gray-100 text-gray-400 dark:bg-gray-700 dark:text-gray-500";
+    return "";
   }
-
   const ratio = count / maxCount;
   if (ratio > 0.7) {
     return "bg-primary-darker text-gray-100 dark:opacity-80";
@@ -36,72 +35,64 @@ const ActivityCalendar = (props: Props) => {
   const weekStartDayOffset = (
     workspaceSettingStore.getWorkspaceSettingByKey(WorkspaceSettingKey.GENERAL).generalSetting || WorkspaceGeneralSetting.fromPartial({})
   ).weekStartDayOffset;
+
   const year = dayjs(monthStr).toDate().getFullYear();
-  const month = dayjs(monthStr).toDate().getMonth() + 1;
-  const dayInMonth = new Date(year, month, 0).getDate();
-  const firstDay = (((new Date(year, month - 1, 1).getDay() - weekStartDayOffset) % 7) + 7) % 7;
-  const lastDay = new Date(year, month - 1, dayInMonth).getDay() - weekStartDayOffset;
+  const month = dayjs(monthStr).toDate().getMonth();
+  const dayInMonth = new Date(year, month + 1, 0).getDate();
+  const firstDay = (((new Date(year, month, 1).getDay() - weekStartDayOffset) % 7) + 7) % 7;
+  const lastDay = new Date(year, month, dayInMonth).getDay() - weekStartDayOffset;
+  const prevMonthDays = new Date(year, month, 0).getDate();
+
   const WEEK_DAYS = [t("days.sun"), t("days.mon"), t("days.tue"), t("days.wed"), t("days.thu"), t("days.fri"), t("days.sat")];
   const weekDays = WEEK_DAYS.slice(weekStartDayOffset).concat(WEEK_DAYS.slice(0, weekStartDayOffset));
   const maxCount = Math.max(...Object.values(data));
   const days = [];
 
-  for (let i = 0; i < firstDay; i++) {
-    days.push(0);
+  // Fill in previous month's days.
+  for (let i = firstDay - 1; i >= 0; i--) {
+    days.push({ day: prevMonthDays - i, isCurrentMonth: false });
   }
+
+  // Fill in current month's days.
   for (let i = 1; i <= dayInMonth; i++) {
-    days.push(i);
+    days.push({ day: i, isCurrentMonth: true });
   }
-  for (let i = 0; i < 6 - lastDay; i++) {
-    days.push(0);
+
+  // Fill in next month's days.
+  for (let i = 1; i < 7 - lastDay; i++) {
+    days.push({ day: i, isCurrentMonth: false });
   }
 
   return (
     <div className={clsx("w-full h-auto shrink-0 grid grid-cols-7 grid-flow-row gap-1")}>
-      {weekDays.map((day, index) => {
-        return (
-          <div key={index} className={clsx("w-6 h-5 text-xs flex justify-center items-center cursor-default opacity-60")}>
-            {day}
-          </div>
-        );
-      })}
-      {days.map((day, index) => {
-        const date = dayjs(`${year}-${month}-${day}`).format("YYYY-MM-DD");
-        const count = data[date] || 0;
+      {weekDays.map((day, index) => (
+        <div key={index} className={clsx("w-6 h-5 text-xs flex justify-center items-center cursor-default opacity-60")}>
+          {day}
+        </div>
+      ))}
+      {days.map((item, index) => {
+        const date = dayjs(`${year}-${month + 1}-${item.day}`).format("YYYY-MM-DD");
+        const count = item.isCurrentMonth ? data[date] || 0 : 0;
         const isToday = dayjs().format("YYYY-MM-DD") === date;
         const tooltipText = count ? t("memo.count-memos-in-date", { count: count, date: date }) : date;
         const isSelected = dayjs(props.selectedDate).format("YYYY-MM-DD") === date;
-        return day ? (
-          count > 0 ? (
-            <Tooltip className="shrink-0" key={`${date}-${index}`} title={tooltipText} placement="top" arrow>
-              <div
-                className={clsx(
-                  "w-6 h-6 text-xs rounded-xl flex justify-center items-center border cursor-default",
-                  getCellAdditionalStyles(count, maxCount),
-                  isToday && "border-zinc-400 dark:border-zinc-300",
-                  isSelected && "font-bold border-zinc-400 dark:border-zinc-300",
-                  !isToday && !isSelected && "border-transparent",
-                )}
-                onClick={() => count && onClick && onClick(date)}
-              >
-                {day}
-              </div>
-            </Tooltip>
-          ) : (
+
+        return (
+          <Tooltip className="shrink-0" key={`${date}-${index}`} title={tooltipText} placement="top" arrow>
             <div
-              key={`${date}-${index}`}
-              className={clsx(
+              className={cn(
                 "w-6 h-6 text-xs rounded-xl flex justify-center items-center border cursor-default",
-                "bg-gray-100 text-gray-400 dark:bg-zinc-800 dark:text-gray-500",
-                isToday && "border-zinc-400 dark:border-zinc-500",
+                "text-gray-400",
+                item.isCurrentMonth ? getCellAdditionalStyles(count, maxCount) : "opacity-60",
+                isToday && "border-zinc-400",
+                isSelected && "font-bold border-zinc-400",
                 !isToday && !isSelected && "border-transparent",
               )}
+              onClick={() => count && onClick && onClick(date)}
             >
-              {day}
+              {item.day}
             </div>
-          )
-        ) : (
-          <div key={`${date}-${index}`} className="shrink-0 w-6 h-6 opacity-0"></div>
+          </Tooltip>
         );
       })}
     </div>
diff --git a/web/src/components/UserStatisticsView.tsx b/web/src/components/UserStatisticsView.tsx
index 60775d94..e35ecd29 100644
--- a/web/src/components/UserStatisticsView.tsx
+++ b/web/src/components/UserStatisticsView.tsx
@@ -1,18 +1,8 @@
 import { Divider, Tooltip } from "@mui/joy";
-import { Button } from "@usememos/mui";
 import clsx from "clsx";
 import dayjs from "dayjs";
 import { countBy } from "lodash-es";
-import {
-  CalendarDaysIcon,
-  CheckCircleIcon,
-  ChevronLeftIcon,
-  ChevronRightIcon,
-  Code2Icon,
-  LinkIcon,
-  ListTodoIcon,
-  MoreVerticalIcon,
-} from "lucide-react";
+import { CalendarDaysIcon, CheckCircleIcon, ChevronLeftIcon, ChevronRightIcon, Code2Icon, LinkIcon, ListTodoIcon } from "lucide-react";
 import { useState } from "react";
 import useAsyncEffect from "@/hooks/useAsyncEffect";
 import useCurrentUser from "@/hooks/useCurrentUser";
@@ -20,7 +10,6 @@ import i18n from "@/i18n";
 import { useMemoFilterStore, useMemoMetadataStore } from "@/store/v1";
 import { useTranslate } from "@/utils/i18n";
 import ActivityCalendar from "./ActivityCalendar";
-import { Popover, PopoverContent, PopoverTrigger } from "./ui/Popover";
 
 interface UserMemoStats {
   link: number;
@@ -71,33 +60,26 @@ const UserStatisticsView = () => {
 
   return (
     <div className="group w-full border mt-2 py-2 px-3 rounded-lg space-y-0.5 text-gray-500 dark:text-gray-400 bg-zinc-50 dark:bg-zinc-900 dark:border-zinc-800">
-      <div className="w-full mb-1 flex flex-row justify-between items-center">
-        <div className="relative text-base font-medium leading-6 flex flex-row items-center dark:text-gray-400">
-          <CalendarDaysIcon className="w-5 h-auto mr-1 opacity-60" strokeWidth={1.5} />
-          <span>{dayjs(visibleMonthString).toDate().toLocaleString(i18n.language, { year: "numeric", month: "long" })}</span>
+      <div className="w-full mb-1 flex flex-row justify-between items-center gap-1">
+        <div className="relative text-sm font-medium inline-flex flex-row items-center w-auto dark:text-gray-400 truncate">
+          <CalendarDaysIcon className="w-4 h-auto mr-1 opacity-60 shrink-0" strokeWidth={1.5} />
+          <span className="truncate">
+            {dayjs(visibleMonthString).toDate().toLocaleString(i18n.language, { year: "numeric", month: "long" })}
+          </span>
         </div>
-        <div className="invisible group-hover:visible flex justify-end items-center">
-          <Popover>
-            <PopoverTrigger>
-              <MoreVerticalIcon className="w-4 h-auto shrink-0 opacity-60" />
-            </PopoverTrigger>
-            <PopoverContent className="flex flex-row justify-end items-center" align="end" alignOffset={-12}>
-              <Button
-                size="sm"
-                variant="plain"
-                onClick={() => setVisibleMonthString(dayjs(visibleMonthString).subtract(1, "month").format("YYYY-MM"))}
-              >
-                <ChevronLeftIcon className="w-5 h-auto shrink-0 opacity-60" />
-              </Button>
-              <Button
-                size="sm"
-                variant="plain"
-                onClick={() => setVisibleMonthString(dayjs(visibleMonthString).add(1, "month").format("YYYY-MM"))}
-              >
-                <ChevronRightIcon className="w-5 h-auto shrink-0 opacity-60" />
-              </Button>
-            </PopoverContent>
-          </Popover>
+        <div className="flex justify-end items-center shrink-0">
+          <span
+            className="cursor-pointer hover:opacity-80"
+            onClick={() => setVisibleMonthString(dayjs(visibleMonthString).subtract(1, "month").format("YYYY-MM"))}
+          >
+            <ChevronLeftIcon className="w-4 h-auto shrink-0 opacity-60" />
+          </span>
+          <span
+            className="cursor-pointer hover:opacity-80"
+            onClick={() => setVisibleMonthString(dayjs(visibleMonthString).add(1, "month").format("YYYY-MM"))}
+          >
+            <ChevronRightIcon className="w-4 h-auto shrink-0 opacity-60" />
+          </span>
         </div>
       </div>
       <div className="w-full">