diff --git a/build/configure/src/web.rs b/build/configure/src/web.rs
index c21695908..fe464c0e3 100644
--- a/build/configure/src/web.rs
+++ b/build/configure/src/web.rs
@@ -184,11 +184,16 @@ fn build_and_check_pages(build: &mut Build) -> Result<()> {
         let group = format!("ts:{name}");
         let deps = inputs![deps, glob!(format!("ts/{name}/**"))];
         let extra_exts = if html { &["css", "html"][..] } else { &["css"] };
+        let entrypoint = if html {
+            format!("ts/routes/{name}/index.ts")
+        } else {
+            format!("ts/{name}/index.ts")
+        };
         build.add_action(
             &group,
             EsbuildScript {
                 script: inputs!["ts/bundle_svelte.mjs"],
-                entrypoint: inputs![format!("ts/{name}/index.ts")],
+                entrypoint: inputs![entrypoint],
                 output_stem: &format!("ts/{name}/{name}"),
                 deps: deps.clone(),
                 extra_exts,
@@ -212,6 +217,16 @@ fn build_and_check_pages(build: &mut Build) -> Result<()> {
             ":sveltekit",
         ],
     )?;
+    build_page(
+        "congrats",
+        true,
+        inputs![
+            //
+            ":ts:lib",
+            ":ts:components",
+            ":sass",
+        ],
+    )?;
 
     Ok(())
 }
diff --git a/ts/routes/congrats/congrats-base.scss b/ts/routes/congrats/congrats-base.scss
index 064256027..319c1f415 100644
--- a/ts/routes/congrats/congrats-base.scss
+++ b/ts/routes/congrats/congrats-base.scss
@@ -1,5 +1,5 @@
-@use "../lib/sass/root-vars";
-@import "../lib/sass/base";
+@use "../../lib/sass/root-vars";
+@import "../../lib/sass/base";
 
 @import "bootstrap/scss/containers";
 
diff --git a/ts/routes/congrats/index.ts b/ts/routes/congrats/index.ts
index 52fc74a3d..995b82c8f 100644
--- a/ts/routes/congrats/index.ts
+++ b/ts/routes/congrats/index.ts
@@ -1,29 +1,34 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+//
+// This old non-Sveltekit entrypoint has been preserved for AnkiWeb compatibility,
+// and can't yet be removed. AnkiWeb loads the generated .js file into an existing
+// page, and mounts into a div with 'id=congrats'. Unlike the desktop, it does not
+// auto-refresh (to reduce the load on AnkiWeb).
 
 import "./congrats-base.scss";
 
 import { congratsInfo } from "@generated/backend";
 import { ModuleName, setupI18n } from "@tslib/i18n";
 import { checkNightMode } from "@tslib/nightmode";
+import { mount } from "svelte";
 
 import CongratsPage from "./CongratsPage.svelte";
 
 const i18n = setupI18n({ modules: [ModuleName.SCHEDULING] });
 
-export async function setupCongrats(): Promise<CongratsPage> {
+export async function setupCongrats(): Promise<void> {
     checkNightMode();
     await i18n;
 
     const customMountPoint = document.getElementById("congrats");
     const info = await congratsInfo({});
-    const page = new CongratsPage({
-        // use #congrats if it exists, otherwise entire body
-        target: customMountPoint ?? document.body,
-        props: { info, refreshPeriodically: !customMountPoint },
-    });
-
-    return page;
+    const props = { info, refreshPeriodically: false };
+    mount(
+        CongratsPage, // use #congrats if it exists, otherwise entire body
+        { target: customMountPoint ?? document.body, props },
+    );
+    return;
 }
 
 setupCongrats();