diff --git a/frontend/src/components/PostEmbed.tsx b/frontend/src/components/PostEmbed.tsx
index 45a2a8e..1be00ce 100644
--- a/frontend/src/components/PostEmbed.tsx
+++ b/frontend/src/components/PostEmbed.tsx
@@ -3,6 +3,7 @@ import YoutubeEmbed from 'react-youtube'
 
 import NicoViewer from '@/components/NicoViewer'
 import TwitterEmbed from '@/components/TwitterEmbed'
+import { useDialogue } from '@/components/dialogues/DialogueProvider'
 
 import type { FC, RefObject } from 'react'
 
@@ -16,6 +17,8 @@ type Props = {
 
 
 export default (({ ref, post, onLoadComplete, onMetadataChange }: Props) => {
+  const dialogue = useDialogue ()
+
   const url = new URL (post.url)
 
   switch (url.hostname.split ('.').slice (-2).join ('.'))
@@ -82,12 +85,17 @@ export default (({ ref, post, onLoadComplete, onMetadataChange }: Props) => {
 		height={360}/>)
 	 : (
 	    <div>
-	      <a href="#" onClick={e => {
+	      <a href="#" onClick={async e => {
 		e.preventDefault ()
-		setFramed (confirm ('未確認の外部ページを表示します。\n'
-				    + '悪意のあるスクリプトが実行される可能性があります。\n'
-				    + '表示しますか?'))
-		return
+
+		setFramed (await dialogue.confirm ({
+		    title: '未確認の外部ページを表示します。',
+		    description: (
+			<div>
+			  <p>悪意のあるスクリプトが実行される可能性があります。</p>
+			  <p>表示しますか?</p>
+			</div>),
+		    confirmText: '表示' }))
 	      }}>
 		外部ページを表示
 	      </a>
diff --git a/frontend/src/components/PostFormTagsArea.tsx b/frontend/src/components/PostFormTagsArea.tsx
index 58e0db4..7588202 100644
--- a/frontend/src/components/PostFormTagsArea.tsx
+++ b/frontend/src/components/PostFormTagsArea.tsx
@@ -36,7 +36,7 @@ type Props = Omit<ComponentPropsWithoutRef<'textarea'>, 'value' | 'onChange' | '
     setTags:  (tags: string) => void }
 
 
-export default (({ tags, setTags, onBlur, ...rest }: Props) => {
+export default (({ tags, setTags, ...rest }: Props) => {
   const ref = useRef<HTMLTextAreaElement> (null)
 
   const [bounds, setBounds] = useState<{ start: number; end: number }> ({ start: 0, end: 0 })
@@ -85,10 +85,9 @@ export default (({ tags, setTags, onBlur, ...rest }: Props) => {
 	      await recompute (pos)
 	    }}
 	    onFocus={() => setFocused (true)}
-	    onBlur={ev => {
+	    onBlur={() => {
 	      setFocused (false)
 	      setSuggestionsVsbl (false)
-	      onBlur?.(ev)
 	    }}/>
 	{focused && (
 	    <TagSearchBox
diff --git a/frontend/src/components/users/InheritDialogue.tsx b/frontend/src/components/users/InheritDialogue.tsx
index 6bb8bb8..b3def1b 100644
--- a/frontend/src/components/users/InheritDialogue.tsx
+++ b/frontend/src/components/users/InheritDialogue.tsx
@@ -1,9 +1,12 @@
 import { useState } from 'react'
 
+import { useDialogue } from '@/components/dialogues/DialogueProvider'
 import { Button } from '@/components/ui/button'
 import { Dialog,
-         DialogContent,
-         DialogTitle } from '@/components/ui/dialog'
+	 DialogContent,
+	 DialogDescription,
+	 DialogHeader,
+	 DialogTitle } from '@/components/ui/dialog'
 import { Input } from '@/components/ui/input'
 import { toast } from '@/components/ui/use-toast'
 import { apiPost } from '@/lib/api'
@@ -16,10 +19,16 @@ type Props = { visible:         boolean
 
 
 export default ({ visible, onVisibleChange, setUser }: Props) => {
+  const dialogue = useDialogue ()
+
   const [inputCode, setInputCode] = useState ('')
 
   const handleTransfer = async () => {
-    if (!(confirm ('引継ぎを行ってもよろしいですか?\n現在のアカウントからはログアウトされます．')))
+    if (!(await dialogue.confirm ({
+	title: '引継ぎを行ってもよろしいですか?',
+	description: '現在のアカウントからはログアウトされます．',
+	confirmText: '引継ぐ',
+	variant: 'danger' })))
       return
 
     try
@@ -44,14 +53,18 @@ export default ({ visible, onVisibleChange, setUser }: Props) => {
 
   return (
       <Dialog open={visible} onOpenChange={onVisibleChange}>
-	<DialogContent>
-	  <DialogTitle>ほかのブラウザから引継ぐ</DialogTitle>
-	  <div className="flex gap-2">
-	    <Input placeholder="引継ぎコードを入力"
-		   value={inputCode}
-		   onChange={ev => setInputCode (ev.target.value)}/>
-	    <Button onClick={handleTransfer}>引継ぐ</Button>
-	  </div>
+	<DialogContent className="px-6 pp-6 pt-7">
+	  <DialogHeader className="pl-8">
+	    <DialogTitle>ほかのブラウザから引継ぐ</DialogTitle>
+	    <DialogDescription asChild>
+	      <div className="flex gap-2">
+		<Input placeholder="引継ぎコードを入力"
+		       value={inputCode}
+		       onChange={ev => setInputCode (ev.target.value)}/>
+		<Button onClick={handleTransfer}>引継ぐ</Button>
+	      </div>
+	    </DialogDescription>
+	  </DialogHeader>
 	</DialogContent>
       </Dialog>)
 }
diff --git a/frontend/src/components/users/UserCodeDialogue.tsx b/frontend/src/components/users/UserCodeDialogue.tsx
index 202b3ca..0b76baf 100644
--- a/frontend/src/components/users/UserCodeDialogue.tsx
+++ b/frontend/src/components/users/UserCodeDialogue.tsx
@@ -1,6 +1,10 @@
+import { useDialogue } from '@/components/dialogues/DialogueProvider'
 import { Button } from '@/components/ui/button'
 import { Dialog,
 	 DialogContent,
+	 DialogDescription,
+	 DialogFooter,
+	 DialogHeader,
 	 DialogTitle } from '@/components/ui/dialog'
 import { toast } from '@/components/ui/use-toast'
 import { apiPost } from '@/lib/api'
@@ -14,11 +18,20 @@ type Props = { visible:         boolean
 
 
 export default ({ visible, onVisibleChange, user, setUser }: Props) => {
+  const dialogue = useDialogue ()
+
   const handleChange = async () => {
     if (!(user))
       return
 
-    if (!(confirm ('引継ぎコードを再発行しますか?\n再発行するとほかのブラウザからはログアウトされます．')))
+    if (!(await dialogue.confirm ({
+	title: '引継ぎコードを再発行しますか?',
+	description: (
+	    <div>
+	      <p>再発行するとほかのブラウザからはログアウトされます．</p>
+	    </div>),
+	confirmText: '再発行',
+	variant: 'danger' })))
       return
 
     const data = await apiPost<{ code: string }> ('/users/code/renew', { },
@@ -33,21 +46,26 @@ export default ({ visible, onVisibleChange, user, setUser }: Props) => {
 
   return (
       <Dialog open={visible} onOpenChange={onVisibleChange}>
-	<DialogContent>
-	  <DialogTitle>引継ぎコード</DialogTitle>
-	  <div>
-	    <p>あなたの引継ぎコードはこちらです：</p>
-	    <div className="m-2">{user?.inheritanceCode}</div>
-	    <p className="mt-1 text-sm text-red-500">
-	      このコードはほかの人には教えないでください!
-	    </p>
-	    <div className="my-4">
-	      <Button onClick={handleChange}
-		      className="px-4 py-2 bg-red-600 text-white rounded disabled:bg-gray-400">
-		引継ぎコード再発行
-	      </Button>
-	    </div>
-	  </div>
+	<DialogContent className="px-6 pb-6 pt-7">
+	  <DialogHeader className="pl-8">
+	    <DialogTitle>引継ぎコード</DialogTitle>
+
+	    <DialogDescription asChild>
+	      <div>
+		<p>あなたの引継ぎコードはこちらです：</p>
+		<div className="m-2">{user?.inheritanceCode}</div>
+		<p className="mt-1 text-sm text-destructive">
+		  このコードはほかの人には教えないでください!
+		</p>
+	      </div>
+	    </DialogDescription>
+	  </DialogHeader>
+
+	  <DialogFooter>
+	    <Button onClick={handleChange} variant="destructive">
+	      引継ぎコード再発行
+	    </Button>
+	  </DialogFooter>
 	</DialogContent>
       </Dialog>)
 }
diff --git a/frontend/src/pages/posts/PostHistoryPage.tsx b/frontend/src/pages/posts/PostHistoryPage.tsx
index 8e6f21e..cabebfc 100644
--- a/frontend/src/pages/posts/PostHistoryPage.tsx
+++ b/frontend/src/pages/posts/PostHistoryPage.tsx
@@ -8,6 +8,7 @@ import TagLink from '@/components/TagLink'
 import PrefetchLink from '@/components/PrefetchLink'
 import PageTitle from '@/components/common/PageTitle'
 import Pagination from '@/components/common/Pagination'
+import { useDialogue } from '@/components/dialogues/DialogueProvider'
 import MainArea from '@/components/layout/MainArea'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
@@ -35,6 +36,8 @@ const renderDiff = (diff: { current: string | null; prev: string | null }) => (
 
 
 export default (() => {
+  const dialogue = useDialogue ()
+
   const location = useLocation ()
   const query = new URLSearchParams (location.search)
   const id = query.get ('id')
@@ -66,8 +69,11 @@ export default (() => {
   const handleRevert = async (e: MouseEvent<HTMLAnchorElement>, change: PostVersion) => {
     e.preventDefault ()
 
-    if (!(confirm (`『${ change.title.current || change.url.current }』を版 ${
-		       change.versionNo } に差戻します．\nよろしいですか?`)))
+    if (!(await dialogue.confirm ({
+	title: '差戻の確認',
+	description: `『${ change.title.current || change.url.current }』を版 ${
+	    change.versionNo } に差戻します．\nよろしいですか?`,
+	confirmText: '差戻' })))
       return
 
     try