Initial commit.

simplifier/src/index.css

+:root {
+  /* Colors */
+  --letterbox-color: rgba(0 0 0 / 100%);
+  --app-background-color: rgba(239 239 239 / 100%);
+  --font-color: rgba(0 0 0 / 100%);
+
+  /* Sizes */
+  --minimum-app-size: 300px;
+}
+
+body {
+  margin: 0;
+  font-family: sans-serif;
+  text-align: center;
+  color: var(--font-color);
+}
+
+#root {
+  position: absolute;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  background: var(--letterbox-color);
+}
+
+#portrait {
+  position: relative;
+  box-sizing: border-box;
+  margin: auto;
+  padding: 1em;
+  min-width: var(--minimum-app-size);
+  min-height: var(--minimum-app-size);
+  width: 100%;
+  height: 100%;
+  max-width: 62.5vh;
+  background: var(--app-background-color);
+  overflow-x: hidden;
+  overflow-y: scroll;
+  transform: scale(1);
+}

simplifier/src/index.js

+import React from 'react';
+import { createRoot } from 'react-dom/client';
+import { HashRouter as Router } from 'react-router-dom';
+
+import { App } from './app.js';
+
+import './index.css';
+
+createRoot(document.getElementById('root')).render(
+  <React.StrictMode>
+    <Router>
+      <div id="portrait">
+        <App />
+      </div>
+    </Router>
+  </React.StrictMode>,
+);

stylelint-config @ 61a0d753

+Subproject commit 61a0d7531d660be5c9fb778cbe23ce76576dc57b