diff --git a/demo/demo.ipynb b/demo/demo.ipynb
index a73ea54..f976e50 100644
--- a/demo/demo.ipynb
+++ b/demo/demo.ipynb
@@ -1,143 +1,143 @@
 {
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "c6ef475d-f4d2-44fe-b4d2-12495d4efe74",
-   "metadata": {},
-   "source": [
-    "# ipywidgets-jsonschema demo"
-   ]
+  "cells": [
+    {
+      "cell_type": "markdown",
+      "id": "c6ef475d-f4d2-44fe-b4d2-12495d4efe74",
+      "metadata": {},
+      "source": [
+        "# ipywidgets-jsonschema demo"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "id": "5b1bb7b8-06ca-473e-8bf7-07592bf29c77",
+      "metadata": {},
+      "source": [
+        "`ipywidgets-jsonschema` allows you to generate a widget form from an existing schema that follows th JSON Schema specification. We first define a schema:"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "id": "0b28466d-54d5-4b3e-909c-1c3038d3d7e6",
+      "metadata": {},
+      "outputs": [],
+      "source": [
+        "schema = {\n",
+        "    \"type\": \"object\",\n",
+        "    \"properties\": {\n",
+        "        \"name\": {\"type\": \"string\", \"title\": \"Name\"},\n",
+        "        \"food\": {\n",
+        "            \"type\": \"array\",\n",
+        "            \"items\": {\"type\": \"string\"},\n",
+        "            \"title\": \"Preferred Food\",\n",
+        "        },\n",
+        "    },\n",
+        "}"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "id": "7cc08b1c-ac7d-4254-941c-81848024dc32",
+      "metadata": {},
+      "source": [
+        "Generating the widget form for it and visualizing it in Jupyter is as simple as this:"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "id": "5c33de7b-4568-49e3-8c40-a901e9bd0505",
+      "metadata": {},
+      "outputs": [],
+      "source": [
+        "from ipywidgets_jsonschema import Form"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "id": "53d75508-3945-496e-8ac4-ecc34b148067",
+      "metadata": {},
+      "outputs": [],
+      "source": [
+        "form = Form(schema)"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "id": "863174a7-1436-4357-9464-36ae24293e91",
+      "metadata": {},
+      "outputs": [],
+      "source": [
+        "form.show(width=\"500px\")"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "id": "68487025-bddd-4820-93c3-cc7f81ce0ad1",
+      "metadata": {},
+      "source": [
+        "To get access to the current data, we can use the `data` property of `form`:"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "id": "f98cda2e-7371-49df-90e3-f6e32ab054b0",
+      "metadata": {},
+      "outputs": [],
+      "source": [
+        "form.data"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "id": "aff26b6e-08ca-4e28-a168-fe0e95d208ea",
+      "metadata": {},
+      "source": [
+        "The data displayed in the widget can also be live-updated by setting the `data` property:"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "id": "cf54749e-92de-46ac-b874-6372b9d5997c",
+      "metadata": {},
+      "outputs": [],
+      "source": [
+        "form.data = {\"name\": \"Me\"}"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "id": "23254122-b5da-48ae-901d-ce1ca69d063a",
+      "metadata": {},
+      "outputs": [],
+      "source": []
+    }
+  ],
+  "metadata": {
+    "kernelspec": {
+      "display_name": "Python 3",
+      "language": "python",
+      "name": "python3"
+    },
+    "language_info": {
+      "codemirror_mode": {
+        "name": "ipython",
+        "version": 3
+      },
+      "file_extension": ".py",
+      "mimetype": "text/x-python",
+      "name": "python",
+      "nbconvert_exporter": "python",
+      "pygments_lexer": "ipython3",
+      "version": "3.9.7"
+    }
   },
-  {
-   "cell_type": "markdown",
-   "id": "5b1bb7b8-06ca-473e-8bf7-07592bf29c77",
-   "metadata": {},
-   "source": [
-    "`ipywidgets-jsonschema` allows you to generate a widget form from an existing schema that follows th JSON Schema specification. We first define a schema:"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "0b28466d-54d5-4b3e-909c-1c3038d3d7e6",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "schema = {\n",
-    "    \"type\": \"object\",\n",
-    "    \"properties\": {\n",
-    "        \"name\": {\"type\": \"string\", \"title\": \"Name\"},\n",
-    "        \"food\": {\n",
-    "            \"type\": \"array\",\n",
-    "            \"items\": {\"type\": \"string\"},\n",
-    "            \"title\": \"Preferred Food\",\n",
-    "        },\n",
-    "    },\n",
-    "}"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "7cc08b1c-ac7d-4254-941c-81848024dc32",
-   "metadata": {},
-   "source": [
-    "Generating the widget form for it and visualizing it in Jupyter is as simple as this:"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "5c33de7b-4568-49e3-8c40-a901e9bd0505",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "from ipywidgets_jsonschema import Form"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "53d75508-3945-496e-8ac4-ecc34b148067",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "form = Form(schema)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "863174a7-1436-4357-9464-36ae24293e91",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "form.show(width=\"500px\")"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "68487025-bddd-4820-93c3-cc7f81ce0ad1",
-   "metadata": {},
-   "source": [
-    "To get access to the current data, we can use the `data` property of `form`:"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "f98cda2e-7371-49df-90e3-f6e32ab054b0",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "form.data"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "aff26b6e-08ca-4e28-a168-fe0e95d208ea",
-   "metadata": {},
-   "source": [
-    "The data displayed in the widget can also be live-updated by setting the `data` property:"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "cf54749e-92de-46ac-b874-6372b9d5997c",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "form.data = {\"name\": \"Me\"}"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "23254122-b5da-48ae-901d-ce1ca69d063a",
-   "metadata": {},
-   "outputs": [],
-   "source": []
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.9.7"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
+  "nbformat": 4,
+  "nbformat_minor": 5
 }