diff --git a/src/client/dom/serviceworker.ts b/src/client/dom/serviceworker.ts
index 6c334f5..f58c182 100644
--- a/src/client/dom/serviceworker.ts
+++ b/src/client/dom/serviceworker.ts
@@ -6,7 +6,7 @@ import { type MessageC2W } from "../../worker";
 export const order = 2;
 
 export default function (client: ScramjetClient, self: Self) {
-	let fakeregistrations = new WeakSet();
+	let registration;
 
 	client.Proxy("Worklet.prototype.addModule", {
 		apply(ctx) {
@@ -16,7 +16,7 @@ export default function (client: ScramjetClient, self: Self) {
 
 	client.Proxy("EventTarget.prototype.addEventListener", {
 		apply(ctx) {
-			if (fakeregistrations.has(ctx.this)) {
+			if (registration === ctx.this) {
 				// do nothing
 				ctx.return(undefined);
 			}
@@ -25,13 +25,19 @@ export default function (client: ScramjetClient, self: Self) {
 
 	client.Proxy("EventTarget.prototype.removeEventListener", {
 		apply(ctx) {
-			if (fakeregistrations.has(ctx.this)) {
+			if (registration === ctx.this) {
 				// do nothing
 				ctx.return(undefined);
 			}
 		},
 	});
 
+	client.Proxy("navigator.serviceWorker.getRegistration", {
+		apply(ctx) {
+			ctx.return(new Promise((resolve) => resolve(registration)));
+		},
+	});
+
 	client.Proxy("navigator.serviceWorker.register", {
 		apply(ctx) {
 			if (ctx.args[0] instanceof URL) ctx.args[0] = ctx.args[0].href;
@@ -80,11 +86,9 @@ export default function (client: ScramjetClient, self: Self) {
 					},
 				}
 			);
-			fakeregistrations.add(fakeRegistration);
+			registration = fakeRegistration;
 
 			ctx.return(new Promise((resolve) => resolve(fakeRegistration)));
 		},
 	});
-
-	// delete self.navigator.serviceWorker;
 }
diff --git a/src/client/swruntime.ts b/src/client/swruntime.ts
index 06d5764..56b997c 100644
--- a/src/client/swruntime.ts
+++ b/src/client/swruntime.ts
@@ -47,6 +47,9 @@ export class ScramjetServiceWorkerRuntime {
 			installing: null,
 			waiting: null,
 		};
+
+		// @ts-ignore
+		this.client.global.ServiceWorkerGlobalScope = this.client.global;
 	}
 }
 
diff --git a/static/ui.js b/static/ui.js
index 0245fe0..56a1519 100644
--- a/static/ui.js
+++ b/static/ui.js
@@ -92,7 +92,7 @@ function App() {
     }
     iframe {
       border: 2px solid #313131;
-      background-color: #121212;
+      background-color: #fff;
       border-radius: 0.5rem;
       margin: 1em;
       margin-top: 0.5em;