use submodule

excalidraw/examples/with-script-in-browser/components/sidebar/ExampleSidebar.scss

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+.sidebar {
+  height: 100%;
+  width: 0;
+  position: absolute;
+  z-index: 1;
+  top: 0;
+  left: 0;
+  background-color: #111;
+  overflow-x: hidden;
+  transition: 0.5s;
+  padding-top: 60px;
+
+  &.open {
+    width: 300px;
+  }
+
+  &-links {
+    display: flex;
+    flex-direction: column;
+    padding: 20px;
+
+    button {
+      padding: 10px;
+      margin: 10px;
+      background: #faa2c1;
+      color: #fff;
+      border: none;
+      cursor: pointer;
+    }
+  }
+}
+
+.sidebar a {
+  padding: 8px 8px 8px 32px;
+  text-decoration: none;
+  font-size: 25px;
+  color: #818181;
+  display: block;
+  transition: 0.3s;
+}
+
+.sidebar a:hover {
+  color: #f1f1f1;
+}
+
+.sidebar .closebtn {
+  position: absolute;
+  top: 0;
+  right: 0;
+  font-size: 36px;
+  margin-left: 50px;
+}
+
+.openbtn {
+  font-size: 20px;
+  cursor: pointer;
+  background-color: #111;
+  color: white;
+  padding: 10px 15px;
+  border: none;
+  display: flex;
+  margin-left: 50px;
+}
+.sidebar-open {
+  margin-left: 300px;
+}

excalidraw/examples/with-script-in-browser/components/sidebar/ExampleSidebar.tsx

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+import React, { useState } from "react";
+
+import "./ExampleSidebar.scss";
+
+export default function Sidebar({ children }: { children: React.ReactNode }) {
+  const [open, setOpen] = useState(false);
+
+  return (
+    <>
+      <div id="mySidebar" className={`sidebar ${open ? "open" : ""}`}>
+        <button className="closebtn" onClick={() => setOpen(false)}>
+          x
+        </button>
+        <div className="sidebar-links">
+          <button>Empty Home</button>
+          <button>Empty About</button>
+        </div>
+      </div>
+      <div className={`${open ? "sidebar-open" : ""}`}>
+        <button
+          className="openbtn"
+          onClick={() => {
+            setOpen(!open);
+          }}
+        >
+          Open Sidebar
+        </button>
+        {children}
+      </div>
+    </>
+  );
+}