Fix issue #1: Add a toggle for dark mode

Author: neubig

src/.backup.App.css

@@ -0,0 +1,42 @@
+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+.logo {
+  height: 6em;
+  padding: 1.5em;
+  will-change: filter;
+  transition: filter 300ms;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #646cffaa);
+}
+.logo.react:hover {
+  filter: drop-shadow(0 0 2em #61dafbaa);
+}
+
+@keyframes logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  a:nth-of-type(2) .logo {
+    animation: logo-spin infinite 20s linear;
+  }
+}
+
+.card {
+  padding: 2em;
+}
+
+.read-the-docs {
+  color: #888;
+}

src/.backup.App.tsx

@@ -0,0 +1,14 @@
+
+import React from 'react'
+import './App.css'
+import PullRequestViewer from './PullRequestViewer'
+
+function App() {
+  return (
+    <div className="App">
+      <PullRequestViewer />
+    </div>
+  )
+}
+
+export default App

src/App.css

@@ -5,6 +5,17 @@
   text-align: center;
 }
 
+body {
+  background-color: #ffffff;
+  color: #213547;
+  transition: background-color 0.3s, color 0.3s;
+}
+
+body.dark-mode {
+  background-color: #242424;
+  color: #ffffff;
+}
+
 .logo {
   height: 6em;
   padding: 1.5em;
@@ -40,3 +51,29 @@
 .read-the-docs {
   color: #888;
 }
+
+.dark-mode-toggle {
+  position: fixed;
+  top: 20px;
+  right: 20px;
+  background-color: #646cff;
+  color: white;
+  border: none;
+  padding: 10px 20px;
+  border-radius: 5px;
+  cursor: pointer;
+  transition: background-color 0.3s;
+}
+
+.dark-mode-toggle:hover {
+  background-color: #535bf2;
+}
+
+.dark-mode .dark-mode-toggle {
+  background-color: #ffffff;
+  color: #242424;
+}
+
+.dark-mode .dark-mode-toggle:hover {
+  background-color: #e6e6e6;
+}

src/App.tsx

@@ -1,11 +1,28 @@
 
-import React from 'react'
+import React, { useState, useEffect } from 'react'
 import './App.css'
 import PullRequestViewer from './PullRequestViewer'
 
 function App() {
+  const [darkMode, setDarkMode] = useState(false)
+
+  useEffect(() => {
+    if (darkMode) {
+      document.body.classList.add('dark-mode')
+    } else {
+      document.body.classList.remove('dark-mode')
+    }
+  }, [darkMode])
+
+  const toggleDarkMode = () => {
+    setDarkMode(!darkMode)
+  }
+
   return (
     <div className="App">
+      <button className="dark-mode-toggle" onClick={toggleDarkMode}>
+        {darkMode ? 'Light Mode' : 'Dark Mode'}
+      </button>
       <PullRequestViewer />
     </div>
   )