diff --git a/src/Components/Subapps/Subapps.tsx b/src/Components/Subapps/Subapps.tsx
index 7713f51..e214117 100644
--- a/src/Components/Subapps/Subapps.tsx
+++ b/src/Components/Subapps/Subapps.tsx
@@ -1,6 +1,7 @@
 import React from "react";
 import {X} from "@phosphor-icons/react";
 import {useCurtain, useCallableCurtain, useCurtains} from "../Curtains/Curtains";
+import {classes, Modify} from "../../Utils";
 
 /**
  * More natural name of useCurtains for subapps.
@@ -23,7 +24,7 @@ export const useCallableSubapp = useCallableCurtain;
 /**
  * Subapp main component.
  */
-export function Subapp({title, closable, children}: React.PropsWithChildren<{
+export function Subapp({className, title, closable, children}: React.PropsWithChildren<Modify<React.HTMLAttributes<HTMLDivElement>, {
 	/**
 	 * Subapp title.
 	 */
@@ -33,7 +34,7 @@ export function Subapp({title, closable, children}: React.PropsWithChildren<{
 	 * Can disable close button.
 	 */
 	closable?: boolean;
-}>)
+}>>)
 {
 	// Subapp is closable by default.
 	closable = closable !== undefined ? closable : true;
@@ -42,7 +43,7 @@ export function Subapp({title, closable, children}: React.PropsWithChildren<{
 	const {close} = useSubapp();
 
 	return (
-		<div className={"subapp"}>
+		<div className={classes("subapp", className)}>
 			<header>
 				<h1>{title ?? ""}</h1>