Allow turning off chat

apps/chat.css

 .chat {
+    z-index: 999;
     background-color: rgba(255, 255, 255, 0.95);
     position: fixed;
     height: 140px;
     right: 0;
     top: 0;
 }
+.not-chat {
+    z-index: 999;
+    background-color: rgba(0, 0, 0, 0.8);
+    position: fixed;
+    height: 100vh;
+    width: 100vw;
+    right: 0;
+    top: 0;
+}
 .chat .actions {
     display: grid;
     grid-template-columns: 1fr auto;

apps/chat.js

         })
     },
     view() {
-        return ChatConfig.isOn ? m('.chat',
-            m('.posts', this.posts.map(post => m(Post, {post}))),
-            m(TextBox),
-        ) : null
+        return ChatConfig.isOn ? [
+            m('.not-chat', {onclick: () => ChatConfig.isOn = false}),
+            m('.chat',
+                m('.posts', this.posts.map(post => m(Post, {post}))),
+                m(TextBox),
+            )
+        ] : null
     },
 }