Add theme switching button

client/src/App.vue

@@ -1,28 +1,71 @@
 <template>
-  <div id="app">
+<div id="app" :class="theme">
   <div id="nav">
     <router-link to="/">Home</router-link> |
     <router-link to="/posts">Posts</router-link> |
     <router-link to="/qa">QA</router-link>
   </div>
   <router-view />
+  <div>
+  <button @click="toggleTheme">{{ themeToggleVerb }} my eyes</button>
   </div>
+</div>
 </template>
 
 <script>
 
 export default {
   name: 'App',
+  data() {
+    return {
+      theme: 'dark'
+    }
+  },
+  computed: {
+	themeToggleVerb: function() {
+          return this.theme === 'light' ? "Save" : "Hurt"
+        }
+  },
+
+  methods: {
+    toggleTheme() {
+      const themes = ['light', 'dark']
+      this.theme = themes[(themes.indexOf(this.theme) + 1) % themes.length]
+    }
+  },
 }
 </script>
 
 <style>
+
+.light {
+  --primary-color: #ffffeb;
+  --text-color: #272736;
+}
+
+.dark {
+  --primary-color: #272736;
+  --text-color: #ffffeb;
+}
+
+.dark a {
+  color: #7e7e8f;
+}
+
+body {
+  background-color: var(--primary-color);
+}
+
 #app {
   font-family: Avenir, Helvetica, Arial, sans-serif;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
   text-align: center;
-  color: #2c3e50;
+  color: var(--text-color);
-  margin-top: 60px;
+  padding-top: 60px;
+  background-color: var(--primary-color);
+  min-height: 100vh;
 }
+
 </style>
+