diff --git a/web/src/components/mod.rs b/web/src/components/mod.rs
index a8da35a..1af74df 100644
--- a/web/src/components/mod.rs
+++ b/web/src/components/mod.rs
@@ -1,2 +1,3 @@
 pub mod card;
 pub mod summary;
+pub mod toast;
diff --git a/web/src/components/toast.rs b/web/src/components/toast.rs
new file mode 100644
index 0000000..a66a2e0
--- /dev/null
+++ b/web/src/components/toast.rs
@@ -0,0 +1,20 @@
+//! Auto-dismissing error toast.
+use gloo_timers::callback::Timeout;
+use sycamore::prelude::*;
+
+const TOAST_MS: u32 = 10_000;
+
+/// Renders the error from `error` as a toast; hides it after `TOAST_MS`.
+/// A new error replaces the message and restarts the timer.
+pub fn toast(error: Signal<Option<String>>) -> View {
+    create_effect(move || {
+        if error.get_clone().is_some() {
+            // Held until cleanup; dropped (cancelled) when the effect re-runs.
+            let timeout = Timeout::new(TOAST_MS, move || error.set(None));
+            on_cleanup(move || drop(timeout));
+        }
+    });
+    view! {
+        (move || error.get_clone().map(|e| view! { div(class="toast") { (e) } }))
+    }
+}
diff --git a/web/src/pages/game.rs b/web/src/pages/game.rs
index 3450007..e64204d 100644
--- a/web/src/pages/game.rs
+++ b/web/src/pages/game.rs
@@ -3,6 +3,7 @@ use sycamore::prelude::*;
 
 use crate::components::card::{card_back, card_img};
 use crate::components::summary::{hand_summary_modal, summary_rows};
+use crate::components::toast::toast;
 use crate::model::{card_label, GameView, MoveView, PlayerView, Scores, ServerMessage};
 use crate::ws::{self, GameSocket};
 
@@ -123,7 +124,7 @@ pub fn GamePage(id: String) -> View {
 
     view! {
         div(class="game-page") {
-            (move || error.get_clone().map(|e| view! { div(class="toast") { (e) } }))
+            (toast(error))
             (move || match game.get_clone() {
                 None => {
                     let status = if closed.get() {
diff --git a/web/src/pages/history.rs b/web/src/pages/history.rs
index d8d6ae1..37a9862 100644
--- a/web/src/pages/history.rs
+++ b/web/src/pages/history.rs
@@ -3,6 +3,7 @@ use wasm_bindgen_futures::spawn_local;
 use sycamore::prelude::*;
 
 use crate::api;
+use crate::components::toast::toast;
 use crate::model::MatchesPage;
 
 #[component]
@@ -45,7 +46,7 @@ pub fn HistoryPage() -> View {
                 a(href="/leaderboard") { "Leaderboard" }
             }
             h1 { "My matches" }
-            (move || error.get_clone().map(|e| view! { div(class="toast") { (e) } }))
+            (toast(error))
             (move || match page.get_clone() {
                 None => view! { p(class="status") { "Loading…" } },
                 Some(_) if rows.get_clone().is_empty() => view! {
diff --git a/web/src/pages/leaderboard.rs b/web/src/pages/leaderboard.rs
index 20a9368..d832b8a 100644
--- a/web/src/pages/leaderboard.rs
+++ b/web/src/pages/leaderboard.rs
@@ -3,6 +3,7 @@ use wasm_bindgen_futures::spawn_local;
 use sycamore::prelude::*;
 
 use crate::api;
+use crate::components::toast::toast;
 use crate::model::LeaderboardPage;
 
 #[component]
@@ -24,7 +25,7 @@ pub fn LeaderboardPage() -> View {
                 a(href="/history") { "My matches" }
             }
             h1 { "Leaderboard" }
-            (move || error.get_clone().map(|e| view! { div(class="toast") { (e) } }))
+            (toast(error))
             (move || match page.get_clone() {
                 None => view! { p(class="status") { "Loading…" } },
                 Some(p) => {
diff --git a/web/src/pages/lobby.rs b/web/src/pages/lobby.rs
index 9ec380f..2e224b2 100644
--- a/web/src/pages/lobby.rs
+++ b/web/src/pages/lobby.rs
@@ -4,6 +4,7 @@ use sycamore::prelude::*;
 use sycamore_router::navigate;
 
 use crate::api;
+use crate::components::toast::toast;
 use crate::model::{GameTypeInfo, User};
 
 /// Used when the game-types fetch fails: match creation must still work.
@@ -70,7 +71,7 @@ pub fn LobbyPage() -> View {
     view! {
         div(class="lobby") {
             h1 { "Scopone scientifico" }
-            (move || error.get_clone().map(|e| view! { div(class="toast") { (e) } }))
+            (toast(error))
             (move || match user.get_clone() {
                 None => view! { p(class="status") { "Loading…" } },
                 Some(None) => view! {