diff --git a/store/session.go b/store/session.go
index a2a2a82..c94b6ea 100644
--- a/store/session.go
+++ b/store/session.go
@@ -102,7 +102,7 @@ func sessionUse(ctx context.Context, log mlog.Log, accountName string, sessionTo
 	if !ok {
 		return LoginSession{}, fmt.Errorf("unknown session token")
 	} else if time.Until(ls.Expires) < 0 {
-		return LoginSession{}, fmt.Errorf("session expired")
+		return LoginSession{}, fmt.Errorf("session expired (after 24 hours inactivity)")
 	} else if csrfToken != "" && csrfToken != ls.csrfToken {
 		return LoginSession{}, fmt.Errorf("mismatch between csrf and session tokens")
 	}
diff --git a/webaccount/account.js b/webaccount/account.js
index 25a6ada..be69378 100644
--- a/webaccount/account.js
+++ b/webaccount/account.js
@@ -885,7 +885,7 @@ const login = async (reason) => {
 		let autosize;
 		let username;
 		let password;
-		const root = dom.div(style({ position: 'absolute', top: 0, right: 0, bottom: 0, left: 0, backgroundColor: '#eee', display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: '1', animation: 'fadein .15s ease-in' }), dom.div(reasonElem = reason ? dom.div(style({ marginBottom: '2ex', textAlign: 'center' }), reason) : dom.div(), dom.div(style({ backgroundColor: 'white', borderRadius: '.25em', padding: '1em', boxShadow: '0 0 20px rgba(0, 0, 0, 0.1)', border: '1px solid #ddd', maxWidth: '95vw', overflowX: 'auto', maxHeight: '95vh', overflowY: 'auto', marginBottom: '20vh' }), dom.form(async function submit(e) {
+		const root = dom.div(style({ position: 'absolute', top: 0, right: 0, bottom: 0, left: 0, backgroundColor: '#eee', display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: '1', animation: 'fadein .15s ease-in' }), dom.div(style({ display: 'flex', flexDirection: 'column', alignItems: 'center' }), reasonElem = reason ? dom.div(style({ marginBottom: '2ex', textAlign: 'center' }), reason) : dom.div(), dom.div(style({ backgroundColor: 'white', borderRadius: '.25em', padding: '1em', boxShadow: '0 0 20px rgba(0, 0, 0, 0.1)', border: '1px solid #ddd', maxWidth: '95vw', overflowX: 'auto', maxHeight: '95vh', overflowY: 'auto', marginBottom: '20vh' }), dom.form(async function submit(e) {
 			e.preventDefault();
 			e.stopPropagation();
 			reasonElem.remove();
diff --git a/webaccount/account.ts b/webaccount/account.ts
index e860066..5875066 100644
--- a/webaccount/account.ts
+++ b/webaccount/account.ts
@@ -19,6 +19,7 @@ const login = async (reason: string) => {
 		const root = dom.div(
 			style({position: 'absolute', top: 0, right: 0, bottom: 0, left: 0, backgroundColor: '#eee', display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: '1', animation: 'fadein .15s ease-in'}),
 			dom.div(
+				style({display: 'flex', flexDirection: 'column', alignItems: 'center'}),
 				reasonElem=reason ? dom.div(style({marginBottom: '2ex', textAlign: 'center'}), reason) : dom.div(),
 				dom.div(
 					style({backgroundColor: 'white', borderRadius: '.25em', padding: '1em', boxShadow: '0 0 20px rgba(0, 0, 0, 0.1)', border: '1px solid #ddd', maxWidth: '95vw', overflowX: 'auto', maxHeight: '95vh', overflowY: 'auto', marginBottom: '20vh'}),
diff --git a/webadmin/admin.js b/webadmin/admin.js
index 3ec8136..5770ed2 100644
--- a/webadmin/admin.js
+++ b/webadmin/admin.js
@@ -1649,7 +1649,7 @@ const login = async (reason) => {
 		let reasonElem;
 		let fieldset;
 		let password;
-		const root = dom.div(style({ position: 'absolute', top: 0, right: 0, bottom: 0, left: 0, backgroundColor: '#eee', display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: '1', animation: 'fadein .15s ease-in' }), dom.div(reasonElem = reason ? dom.div(style({ marginBottom: '2ex', textAlign: 'center' }), reason) : dom.div(), dom.div(style({ backgroundColor: 'white', borderRadius: '.25em', padding: '1em', boxShadow: '0 0 20px rgba(0, 0, 0, 0.1)', border: '1px solid #ddd', maxWidth: '95vw', overflowX: 'auto', maxHeight: '95vh', overflowY: 'auto', marginBottom: '20vh' }), dom.form(async function submit(e) {
+		const root = dom.div(style({ position: 'absolute', top: 0, right: 0, bottom: 0, left: 0, backgroundColor: '#eee', display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: '1', animation: 'fadein .15s ease-in' }), dom.div(style({ display: 'flex', flexDirection: 'column', alignItems: 'center' }), reasonElem = reason ? dom.div(style({ marginBottom: '2ex', textAlign: 'center' }), reason) : dom.div(), dom.div(style({ backgroundColor: 'white', borderRadius: '.25em', padding: '1em', boxShadow: '0 0 20px rgba(0, 0, 0, 0.1)', border: '1px solid #ddd', maxWidth: '95vw', overflowX: 'auto', maxHeight: '95vh', overflowY: 'auto', marginBottom: '20vh' }), dom.form(async function submit(e) {
 			e.preventDefault();
 			e.stopPropagation();
 			reasonElem.remove();
diff --git a/webadmin/admin.ts b/webadmin/admin.ts
index 393939d..c5d504e 100644
--- a/webadmin/admin.ts
+++ b/webadmin/admin.ts
@@ -16,6 +16,7 @@ const login = async (reason: string) => {
 		const root = dom.div(
 			style({position: 'absolute', top: 0, right: 0, bottom: 0, left: 0, backgroundColor: '#eee', display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: '1', animation: 'fadein .15s ease-in'}),
 			dom.div(
+				style({display: 'flex', flexDirection: 'column', alignItems: 'center'}),
 				reasonElem=reason ? dom.div(style({marginBottom: '2ex', textAlign: 'center'}), reason) : dom.div(),
 				dom.div(
 					style({backgroundColor: 'white', borderRadius: '.25em', padding: '1em', boxShadow: '0 0 20px rgba(0, 0, 0, 0.1)', border: '1px solid #ddd', maxWidth: '95vw', overflowX: 'auto', maxHeight: '95vh', overflowY: 'auto', marginBottom: '20vh'}),
diff --git a/webauth/admin.go b/webauth/admin.go
index 6358ca4..b0387ed 100644
--- a/webauth/admin.go
+++ b/webauth/admin.go
@@ -105,9 +105,9 @@ func (a *adminSessionAuth) use(ctx context.Context, log mlog.Log, accountName st
 
 	s, ok := a.sessions[sessionToken]
 	if !ok {
-		return "", fmt.Errorf("unknown session")
+		return "", fmt.Errorf("unknown session (due to server restart or 10 new admin sessions)")
 	} else if time.Until(s.expires) < 0 {
-		return "", fmt.Errorf("session expired")
+		return "", fmt.Errorf("session expired (after 12 hours inactivity)")
 	} else if csrfToken != "" && csrfToken != s.csrfToken {
 		return "", fmt.Errorf("mismatch between csrf and session tokens")
 	}
diff --git a/webmail/webmail.js b/webmail/webmail.js
index d6f37c5..34d66df 100644
--- a/webmail/webmail.js
+++ b/webmail/webmail.js
@@ -1631,7 +1631,7 @@ const login = async (reason) => {
 		let autosize;
 		let username;
 		let password;
-		const root = dom.div(css('loginOverlay', { position: 'absolute', top: 0, right: 0, bottom: 0, left: 0, backgroundColor: styles.overlayOpaqueBackgroundColor, display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: zindexes.login, animation: 'fadein .15s ease-in' }), dom.div(reasonElem = reason ? dom.div(css('sessionError', { marginBottom: '2ex', textAlign: 'center' }), reason) : dom.div(), dom.div(css('loginPopup', {
+		const root = dom.div(css('loginOverlay', { position: 'absolute', top: 0, right: 0, bottom: 0, left: 0, backgroundColor: styles.overlayOpaqueBackgroundColor, display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: zindexes.login, animation: 'fadein .15s ease-in' }), dom.div(style({ display: 'flex', flexDirection: 'column', alignItems: 'center' }), reasonElem = reason ? dom.div(css('sessionError', { marginBottom: '2ex', textAlign: 'center' }), reason) : dom.div(), dom.div(css('loginPopup', {
 			backgroundColor: styles.popupBackgroundColor,
 			boxShadow: styles.boxShadow,
 			border: '1px solid',
diff --git a/webmail/webmail.ts b/webmail/webmail.ts
index 5c2a24b..51d6319 100644
--- a/webmail/webmail.ts
+++ b/webmail/webmail.ts
@@ -271,6 +271,7 @@ const login = async (reason: string) => {
 		const root = dom.div(
 			css('loginOverlay', {position: 'absolute', top: 0, right: 0, bottom: 0, left: 0, backgroundColor: styles.overlayOpaqueBackgroundColor, display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: zindexes.login, animation: 'fadein .15s ease-in'}),
 			dom.div(
+				style({display: 'flex', flexDirection: 'column', alignItems: 'center'}),
 				reasonElem=reason ? dom.div(css('sessionError', {marginBottom: '2ex', textAlign: 'center'}), reason) : dom.div(),
 				dom.div(
 					css('loginPopup', {