diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6d56e50a4..05704b509c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@
 ### Client
 - Feat: チャットウィジェットを追加
 - Feat: デッキにチャットカラムを追加
+- Feat: タイトルバーを表示できるように
 - Enhance: Unicode絵文字をslugから入力する際に`:ok:`のように最後の`:`を入力したあとにUnicode絵文字に変換できるように
 - Enhance: コントロールパネルでジョブキューをクリアできるように
 - Enhance: テーマでページヘッダーの色を変更できるように
diff --git a/packages/backend/src/server/web/style.css b/packages/backend/src/server/web/style.css
index 5d81f2bed0..8e63a2ea66 100644
--- a/packages/backend/src/server/web/style.css
+++ b/packages/backend/src/server/web/style.css
@@ -31,6 +31,7 @@ html {
 	margin: auto;
 	width: 64px;
 	height: 64px;
+	border-radius: 10px;
 	pointer-events: none;
 }
 
diff --git a/packages/backend/src/server/web/style.embed.css b/packages/backend/src/server/web/style.embed.css
index 5e8786cc4e..0911d562bf 100644
--- a/packages/backend/src/server/web/style.embed.css
+++ b/packages/backend/src/server/web/style.embed.css
@@ -53,6 +53,7 @@ html.embed.noborder #splash {
 	margin: auto;
 	width: 64px;
 	height: 64px;
+	border-radius: 10px;
 	pointer-events: none;
 }
 
diff --git a/packages/frontend/src/pages/settings/preferences.vue b/packages/frontend/src/pages/settings/preferences.vue
index f96accf68a..57b140f97b 100644
--- a/packages/frontend/src/pages/settings/preferences.vue
+++ b/packages/frontend/src/pages/settings/preferences.vue
@@ -42,6 +42,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 						</SearchMarker>
 
 						<div class="_gaps_s">
+							<SearchMarker :keywords="['titlebar', 'show']">
+								<MkPreferenceContainer k="showTitlebar">
+									<MkSwitch v-model="showTitlebar">
+										<template #label><SearchLabel>{{ i18n.ts.showTitlebar }}</SearchLabel></template>
+									</MkSwitch>
+								</MkPreferenceContainer>
+							</SearchMarker>
+
 							<SearchMarker :keywords="['avatar', 'icon', 'decoration', 'show']">
 								<MkPreferenceContainer k="showAvatarDecorations">
 									<MkSwitch v-model="showAvatarDecorations">
@@ -742,6 +750,7 @@ const lang = ref(miLocalStorage.getItem('lang'));
 const dataSaver = ref(prefer.s.dataSaver);
 
 const overridedDeviceKind = prefer.model('overridedDeviceKind');
+const showTitlebar = prefer.model('showTitlebar');
 const keepCw = prefer.model('keepCw');
 const serverDisconnectedBehavior = prefer.model('serverDisconnectedBehavior');
 const hemisphere = prefer.model('hemisphere');
diff --git a/packages/frontend/src/preferences/def.ts b/packages/frontend/src/preferences/def.ts
index ac8996058f..73c6ff96c9 100644
--- a/packages/frontend/src/preferences/def.ts
+++ b/packages/frontend/src/preferences/def.ts
@@ -333,6 +333,9 @@ export const PREF_DEF = {
 	showNavbarSubButtons: {
 		default: true,
 	},
+	showTitlebar: {
+		default: false,
+	},
 	plugins: {
 		default: [] as Plugin[],
 	},
diff --git a/packages/frontend/src/ui/_common_/common.vue b/packages/frontend/src/ui/_common_/common.vue
index d7d89d3f5c..5fe99e0d14 100644
--- a/packages/frontend/src/ui/_common_/common.vue
+++ b/packages/frontend/src/ui/_common_/common.vue
@@ -413,7 +413,7 @@ if ($i) {
 
 #devTicker {
 	position: fixed;
-	top: 0;
+	bottom: 0;
 	left: 0;
 	z-index: 2147483647;
 	color: #ff0;
diff --git a/packages/frontend/src/ui/_common_/navbar-for-mobile.vue b/packages/frontend/src/ui/_common_/navbar-for-mobile.vue
index e0cd58439e..826e03751a 100644
--- a/packages/frontend/src/ui/_common_/navbar-for-mobile.vue
+++ b/packages/frontend/src/ui/_common_/navbar-for-mobile.vue
@@ -121,6 +121,7 @@ function more() {
 	display: inline-block;
 	width: 38px;
 	aspect-ratio: 1;
+	border-radius: 8px;
 }
 
 .bottom {
diff --git a/packages/frontend/src/ui/_common_/navbar.vue b/packages/frontend/src/ui/_common_/navbar.vue
index 9c6cdecf5c..ce8efa3324 100644
--- a/packages/frontend/src/ui/_common_/navbar.vue
+++ b/packages/frontend/src/ui/_common_/navbar.vue
@@ -7,7 +7,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 <div :class="[$style.root, { [$style.iconOnly]: iconOnly }]">
 	<div :class="$style.body">
 		<div :class="$style.top">
-			<div :class="$style.banner" :style="{ backgroundImage: `url(${ instance.bannerUrl })` }"></div>
 			<button v-tooltip.noDelay.right="instance.name ?? i18n.ts.instance" class="_button" :class="$style.instance" @click="openInstanceMenu">
 				<img :src="instance.iconUrl || instance.faviconUrl || '/favicon.ico'" alt="" :class="$style.instanceIcon" style="viewTransitionName: navbar-serverIcon;"/>
 			</button>
@@ -183,12 +182,9 @@ function menuEdit() {
 }
 
 .body {
-	position: fixed;
-	top: 0;
-	left: 0;
-	z-index: 1001;
+	position: relative;
 	width: var(--nav-icon-only-width);
-	height: 100dvh;
+	height: 100%;
 	box-sizing: border-box;
 	overflow: auto;
 	overflow-x: clip;
@@ -303,18 +299,6 @@ function menuEdit() {
 		backdrop-filter: var(--MI-blur, blur(8px));
 	}
 
-	.banner {
-		position: absolute;
-		top: 0;
-		left: 0;
-		width: 100%;
-		height: 100%;
-		background-size: cover;
-		background-position: center center;
-		-webkit-mask-image: linear-gradient(0deg, rgba(0,0,0,0) 15%, rgba(0,0,0,0.75) 100%);
-		mask-image: linear-gradient(0deg, rgba(0,0,0,0) 15%, rgba(0,0,0,0.75) 100%);
-	}
-
 	.instance {
 		position: relative;
 		display: block;
@@ -335,6 +319,7 @@ function menuEdit() {
 		display: inline-block;
 		width: 38px;
 		aspect-ratio: 1;
+		border-radius: 8px;
 	}
 
 	.bottom {
@@ -559,6 +544,7 @@ function menuEdit() {
 		display: inline-block;
 		width: 30px;
 		aspect-ratio: 1;
+		border-radius: 8px;
 	}
 
 	.bottom {
diff --git a/packages/frontend/src/ui/_common_/titlebar.vue b/packages/frontend/src/ui/_common_/titlebar.vue
new file mode 100644
index 0000000000..c62b13b73a
--- /dev/null
+++ b/packages/frontend/src/ui/_common_/titlebar.vue
@@ -0,0 +1,87 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="$style.root">
+	<div :class="$style.title">
+		<img :src="instance.iconUrl || instance.faviconUrl || '/favicon.ico'" alt="" :class="$style.instanceIcon"/>
+		<span :class="$style.instanceTitle">{{ instance.name ?? host }}</span>
+	</div>
+	<div :class="$style.controls">
+		<span :class="$style.left">
+			<button v-if="canBack" class="_button" :class="$style.button" @click="goBack"><i class="ti ti-arrow-left"></i></button>
+		</span>
+		<span :class="$style.right">
+		</span>
+	</div>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { host } from '@@/js/config.js';
+import { ref } from 'vue';
+import { instance } from '@/instance.js';
+import { prefer } from '@/preferences.js';
+
+const canBack = ref(true);
+
+function goBack() {
+	window.history.back();
+}
+</script>
+
+<style lang="scss" module>
+.root {
+	--height: 36px;
+
+	background: var(--MI_THEME-navBg);
+	height: var(--height);
+	font-size: 90%;
+}
+
+.title {
+	display: flex;
+	justify-content: center;
+	align-items: center;
+	text-align: center;
+	height: var(--height);
+}
+
+.controls {
+	position: absolute;
+	top: 0;
+	left: 0;
+	display: flex;
+	justify-content: center;
+	align-items: center;
+	height: var(--height);
+}
+
+.instanceIcon {
+	display: inline-block;
+	width: 20px;
+	aspect-ratio: 1;
+	border-radius: 5px;
+	margin-right: 8px;
+}
+
+.instanceTitle {
+	display: inline-block;
+}
+
+.left {
+	margin-right: auto;
+}
+
+.right {
+	margin-left: auto;
+}
+
+.button {
+	display: inline-block;
+	height: var(--height);
+	aspect-ratio: 1;
+}
+</style>
diff --git a/packages/frontend/src/ui/deck.vue b/packages/frontend/src/ui/deck.vue
index 7556f513c2..f702e8ef44 100644
--- a/packages/frontend/src/ui/deck.vue
+++ b/packages/frontend/src/ui/deck.vue
@@ -4,71 +4,75 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div :class="[$style.root, { [$style.withWallpaper]: withWallpaper }]">
-	<XSidebar v-if="!isMobile && prefer.r['deck.navbarPosition'].value === 'left'"/>
+<div :class="[$style.root]">
+	<XTitlebar v-if="prefer.r.showTitlebar.value" style="flex-shrink: 0;"/>
 
-	<div :class="$style.main">
-		<XNavbarH v-if="!isMobile && prefer.r['deck.navbarPosition'].value === 'top'"/>
+	<div :class="$style.nonTitlebarArea">
+		<XSidebar v-if="!isMobile && prefer.r['deck.navbarPosition'].value === 'left'"/>
 
-		<XAnnouncements v-if="$i"/>
-		<XStatusBars/>
-		<div :class="$style.columnsWrapper">
-			<!-- passive: https://bugs.webkit.org/show_bug.cgi?id=281300 -->
-			<div ref="columnsEl" :class="[$style.columns, { [$style.center]: prefer.r['deck.columnAlign'].value === 'center', [$style.snapScroll]: snapScroll }]" @contextmenu.self.prevent="onContextmenu" @wheel.passive.self="onWheel">
-				<!-- sectionを利用しているのは、deck.vue側でcolumnに対してfirst-of-typeを効かせるため -->
-				<section
-					v-for="ids in layout"
-					:class="$style.section"
-					:style="columns.filter(c => ids.includes(c.id)).some(c => c.flexible) ? { flex: 1, minWidth: '350px' } : { width: Math.max(...columns.filter(c => ids.includes(c.id)).map(c => c.width)) + 'px' }"
-					@wheel.passive.self="onWheel"
-				>
-					<component
-						:is="columnComponents[columns.find(c => c.id === id)!.type] ?? XTlColumn"
-						v-for="id in ids"
-						:ref="id"
-						:key="id"
-						:class="[$style.column, { '_shadow': withWallpaper }]"
-						:column="columns.find(c => c.id === id)!"
-						:isStacked="ids.length > 1"
-						@headerWheel="onWheel"
-					/>
-				</section>
-				<div v-if="layout.length === 0" class="_panel" :class="$style.onboarding">
-					<div>{{ i18n.ts._deck.introduction }}</div>
-					<div>{{ i18n.ts._deck.introduction2 }}</div>
+		<div :class="[$style.main, { [$style.withWallpaper]: withWallpaper, [$style.withSidebarAndTitlebar]: !isMobile && prefer.r['deck.navbarPosition'].value === 'left' && prefer.r.showTitlebar.value }]" :style="{ backgroundImage: prefer.s['deck.wallpaper'] != null ? `url(${ prefer.s['deck.wallpaper'] })` : null }">
+			<XNavbarH v-if="!isMobile && prefer.r['deck.navbarPosition'].value === 'top'"/>
+
+			<XAnnouncements v-if="$i"/>
+			<XStatusBars/>
+			<div :class="$style.columnsWrapper">
+				<!-- passive: https://bugs.webkit.org/show_bug.cgi?id=281300 -->
+				<div ref="columnsEl" :class="[$style.columns, { [$style.center]: prefer.r['deck.columnAlign'].value === 'center', [$style.snapScroll]: snapScroll }]" @contextmenu.self.prevent="onContextmenu" @wheel.passive.self="onWheel">
+					<!-- sectionを利用しているのは、deck.vue側でcolumnに対してfirst-of-typeを効かせるため -->
+					<section
+						v-for="ids in layout"
+						:class="$style.section"
+						:style="columns.filter(c => ids.includes(c.id)).some(c => c.flexible) ? { flex: 1, minWidth: '350px' } : { width: Math.max(...columns.filter(c => ids.includes(c.id)).map(c => c.width)) + 'px' }"
+						@wheel.passive.self="onWheel"
+					>
+						<component
+							:is="columnComponents[columns.find(c => c.id === id)!.type] ?? XTlColumn"
+							v-for="id in ids"
+							:ref="id"
+							:key="id"
+							:class="[$style.column, { '_shadow': withWallpaper }]"
+							:column="columns.find(c => c.id === id)!"
+							:isStacked="ids.length > 1"
+							@headerWheel="onWheel"
+						/>
+					</section>
+					<div v-if="layout.length === 0" class="_panel" :class="$style.onboarding">
+						<div>{{ i18n.ts._deck.introduction }}</div>
+						<div>{{ i18n.ts._deck.introduction2 }}</div>
+					</div>
+				</div>
+
+				<div v-if="prefer.r['deck.menuPosition'].value === 'right'" :class="$style.sideMenu">
+					<div :class="$style.sideMenuTop">
+						<button v-tooltip.noDelay.left="`${i18n.ts._deck.profile}: ${prefer.s['deck.profile']}`" :class="$style.sideMenuButton" class="_button" @click="switchProfileMenu"><i class="ti ti-caret-down"></i></button>
+						<button v-tooltip.noDelay.left="i18n.ts._deck.deleteProfile" :class="$style.sideMenuButton" class="_button" @click="deleteProfile"><i class="ti ti-trash"></i></button>
+					</div>
+					<div :class="$style.sideMenuMiddle">
+						<button v-tooltip.noDelay.left="i18n.ts._deck.addColumn" :class="$style.sideMenuButton" class="_button" @click="addColumn"><i class="ti ti-plus"></i></button>
+					</div>
+					<div :class="$style.sideMenuBottom">
+						<button v-tooltip.noDelay.left="i18n.ts.settings" :class="$style.sideMenuButton" class="_button" @click="showSettings"><i class="ti ti-settings-2"></i></button>
+					</div>
 				</div>
 			</div>
 
-			<div v-if="prefer.r['deck.menuPosition'].value === 'right'" :class="$style.sideMenu">
-				<div :class="$style.sideMenuTop">
-					<button v-tooltip.noDelay.left="`${i18n.ts._deck.profile}: ${prefer.s['deck.profile']}`" :class="$style.sideMenuButton" class="_button" @click="switchProfileMenu"><i class="ti ti-caret-down"></i></button>
-					<button v-tooltip.noDelay.left="i18n.ts._deck.deleteProfile" :class="$style.sideMenuButton" class="_button" @click="deleteProfile"><i class="ti ti-trash"></i></button>
+			<div v-if="prefer.r['deck.menuPosition'].value === 'bottom'" :class="$style.bottomMenu">
+				<div :class="$style.bottomMenuLeft">
+					<button v-tooltip.noDelay.left="`${i18n.ts._deck.profile}: ${prefer.s['deck.profile']}`" :class="$style.bottomMenuButton" class="_button" @click="switchProfileMenu"><i class="ti ti-caret-down"></i></button>
+					<button v-tooltip.noDelay.left="i18n.ts._deck.deleteProfile" :class="$style.bottomMenuButton" class="_button" @click="deleteProfile"><i class="ti ti-trash"></i></button>
 				</div>
-				<div :class="$style.sideMenuMiddle">
-					<button v-tooltip.noDelay.left="i18n.ts._deck.addColumn" :class="$style.sideMenuButton" class="_button" @click="addColumn"><i class="ti ti-plus"></i></button>
+				<div :class="$style.bottomMenuMiddle">
+					<button v-tooltip.noDelay.left="i18n.ts._deck.addColumn" :class="$style.bottomMenuButton" class="_button" @click="addColumn"><i class="ti ti-plus"></i></button>
 				</div>
-				<div :class="$style.sideMenuBottom">
-					<button v-tooltip.noDelay.left="i18n.ts.settings" :class="$style.sideMenuButton" class="_button" @click="showSettings"><i class="ti ti-settings-2"></i></button>
+				<div :class="$style.bottomMenuRight">
+					<button v-tooltip.noDelay.left="i18n.ts.settings" :class="$style.bottomMenuButton" class="_button" @click="showSettings"><i class="ti ti-settings-2"></i></button>
 				</div>
 			</div>
+
+			<XNavbarH v-if="!isMobile && prefer.r['deck.navbarPosition'].value === 'bottom'"/>
+
+			<XMobileFooterMenu v-if="isMobile" v-model:drawerMenuShowing="drawerMenuShowing" v-model:widgetsShowing="widgetsShowing"/>
 		</div>
-
-		<div v-if="prefer.r['deck.menuPosition'].value === 'bottom'" :class="$style.bottomMenu">
-			<div :class="$style.bottomMenuLeft">
-				<button v-tooltip.noDelay.left="`${i18n.ts._deck.profile}: ${prefer.s['deck.profile']}`" :class="$style.bottomMenuButton" class="_button" @click="switchProfileMenu"><i class="ti ti-caret-down"></i></button>
-				<button v-tooltip.noDelay.left="i18n.ts._deck.deleteProfile" :class="$style.bottomMenuButton" class="_button" @click="deleteProfile"><i class="ti ti-trash"></i></button>
-			</div>
-			<div :class="$style.bottomMenuMiddle">
-				<button v-tooltip.noDelay.left="i18n.ts._deck.addColumn" :class="$style.bottomMenuButton" class="_button" @click="addColumn"><i class="ti ti-plus"></i></button>
-			</div>
-			<div :class="$style.bottomMenuRight">
-				<button v-tooltip.noDelay.left="i18n.ts.settings" :class="$style.bottomMenuButton" class="_button" @click="showSettings"><i class="ti ti-settings-2"></i></button>
-			</div>
-		</div>
-
-		<XNavbarH v-if="!isMobile && prefer.r['deck.navbarPosition'].value === 'bottom'"/>
-
-		<XMobileFooterMenu v-if="isMobile" v-model:drawerMenuShowing="drawerMenuShowing" v-model:widgetsShowing="widgetsShowing"/>
 	</div>
 
 	<XCommon v-model:drawerMenuShowing="drawerMenuShowing" v-model:widgetsShowing="widgetsShowing"/>
@@ -82,6 +86,7 @@ import XCommon from './_common_/common.vue';
 import XSidebar from '@/ui/_common_/navbar.vue';
 import XNavbarH from '@/ui/_common_/navbar-h.vue';
 import XMobileFooterMenu from '@/ui/_common_/mobile-footer-menu.vue';
+import XTitlebar from '@/ui/_common_/titlebar.vue';
 import * as os from '@/os.js';
 import { $i } from '@/i.js';
 import { i18n } from '@/i18n.js';
@@ -209,30 +214,25 @@ async function deleteProfile() {
 
 window.document.documentElement.style.overflowY = 'hidden';
 window.document.documentElement.style.scrollBehavior = 'auto';
-
-if (prefer.s['deck.wallpaper'] != null) {
-	window.document.documentElement.style.backgroundImage = `url(${prefer.s['deck.wallpaper']})`;
-}
 </script>
 
 <style lang="scss" module>
 .root {
-	$nav-hide-threshold: 650px; // TODO: どこかに集約したい
-
 	--MI-margin: var(--MI-marginHalf);
 
 	--columnGap: v-bind("gap + 'px'");
 
 	display: flex;
+	flex-direction: column;
 	height: 100dvh;
 	box-sizing: border-box;
 	flex: 1;
+	background: var(--MI_THEME-navBg);
+}
 
-	&.withWallpaper {
-		.main {
-			background: transparent;
-		}
-	}
+.nonTitlebarArea {
+	display: flex;
+	flex: 1;
 }
 
 .main {
@@ -240,7 +240,15 @@ if (prefer.s['deck.wallpaper'] != null) {
 	min-width: 0;
 	display: flex;
 	flex-direction: column;
-	background: var(--MI_THEME-deckBg);
+
+	&:not(.withWallpaper) {
+		background: var(--MI_THEME-deckBg);
+	}
+
+	&.withSidebarAndTitlebar {
+		border-radius: 12px 0 0 0;
+		overflow: clip;
+	}
 }
 
 .columnsWrapper {
diff --git a/packages/frontend/src/ui/universal.vue b/packages/frontend/src/ui/universal.vue
index 31c3bdff54..4bf7e9262b 100644
--- a/packages/frontend/src/ui/universal.vue
+++ b/packages/frontend/src/ui/universal.vue
@@ -5,21 +5,25 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <div :class="[$style.root, { '_forceShrinkSpacer': deviceKind === 'smartphone' }]">
-	<XSidebar v-if="!isMobile" :class="$style.sidebar" :showWidgetButton="!isDesktop" @widgetButtonClick="widgetsShowing = true"/>
+	<XTitlebar v-if="prefer.r.showTitlebar.value" style="flex-shrink: 0;"/>
 
-	<div :class="$style.contents" @contextmenu.stop="onContextmenu">
-		<div>
-			<XPreferenceRestore v-if="shouldSuggestRestoreBackup"/>
-			<XAnnouncements v-if="$i"/>
-			<XStatusBars :class="$style.statusbars"/>
+	<div :class="$style.nonTitlebarArea">
+		<XSidebar v-if="!isMobile" :class="$style.sidebar" :showWidgetButton="!isDesktop" @widgetButtonClick="widgetsShowing = true"/>
+
+		<div :class="[$style.contents, !isMobile && prefer.r.showTitlebar.value ? $style.withSidebarAndTitlebar : null]" @contextmenu.stop="onContextmenu">
+			<div>
+				<XPreferenceRestore v-if="shouldSuggestRestoreBackup"/>
+				<XAnnouncements v-if="$i"/>
+				<XStatusBars :class="$style.statusbars"/>
+			</div>
+			<StackingRouterView v-if="prefer.s['experimental.stackingRouterView']" :class="$style.content"/>
+			<RouterView v-else :class="$style.content"/>
+			<XMobileFooterMenu v-if="isMobile" ref="navFooter" v-model:drawerMenuShowing="drawerMenuShowing" v-model:widgetsShowing="widgetsShowing"/>
 		</div>
-		<StackingRouterView v-if="prefer.s['experimental.stackingRouterView']" :class="$style.content"/>
-		<RouterView v-else :class="$style.content"/>
-		<XMobileFooterMenu v-if="isMobile" ref="navFooter" v-model:drawerMenuShowing="drawerMenuShowing" v-model:widgetsShowing="widgetsShowing"/>
-	</div>
 
-	<div v-if="isDesktop && !pageMetadata?.needWideArea" :class="$style.widgets">
-		<XWidgets/>
+		<div v-if="isDesktop && !pageMetadata?.needWideArea" :class="$style.widgets">
+			<XWidgets/>
+		</div>
 	</div>
 
 	<XCommon v-model:drawerMenuShowing="drawerMenuShowing" v-model:widgetsShowing="widgetsShowing"/>
@@ -34,6 +38,7 @@ import XCommon from './_common_/common.vue';
 import type { PageMetadata } from '@/page.js';
 import XMobileFooterMenu from '@/ui/_common_/mobile-footer-menu.vue';
 import XPreferenceRestore from '@/ui/_common_/PreferenceRestore.vue';
+import XTitlebar from '@/ui/_common_/titlebar.vue';
 import * as os from '@/os.js';
 import { i18n } from '@/i18n.js';
 import { $i } from '@/i.js';
@@ -128,8 +133,14 @@ $widgets-hide-threshold: 1090px;
 	height: 100dvh;
 	overflow: clip;
 	contain: strict;
-	box-sizing: border-box;
 	display: flex;
+	flex-direction: column;
+	background: var(--MI_THEME-navBg);
+}
+
+.nonTitlebarArea {
+	display: flex;
+	flex: 1;
 }
 
 .sidebar {
@@ -142,7 +153,12 @@ $widgets-hide-threshold: 1090px;
 	flex: 1;
 	height: 100%;
 	min-width: 0;
-	background: var(--MI_THEME-bg);
+
+	&.withSidebarAndTitlebar {
+		background: var(--MI_THEME-navBg);
+		border-radius: 12px 0 0 0;
+		overflow: clip;
+	}
 }
 
 .content {