Convert app into node version with express.

public/css/styles.css

@@ -0,0 +1,28 @@
+body {
+    background-color: #222;
+    color: white;
+}
+
+.choice-btn {
+    padding: 5px 10px;
+    border-radius: 3px;
+    border: 1px solid black;
+    margin: 2px;
+}
+
+.choice-btn:hover {
+    background-color: #ccc;
+}
+
+.choice-div {
+    border: 1px green solid;
+}
+
+.node-div {
+    border: 1px red solid;
+}
+
+#content {
+    width: 500px;
+    margin: auto;
+}