build: improved confetti demo page

Author: matteobruni

demo/vanilla/public/javascripts/confetti.js

@@ -1,6 +1,6 @@
-var end = Date.now() + (15 * 1000);
+const end = Date.now() + (15 * 1000),
+    colors = ['#bb0000', '#ffffff'];
 
-var colors = ['#bb0000', '#ffffff'];
 
 (function frame() {
   confetti({
@@ -21,4 +21,4 @@ var colors = ['#bb0000', '#ffffff'];
   if (Date.now() < end) {
     requestAnimationFrame(frame);
   }
-}());
+}());

demo/vanilla/views/confetti.pug

@@ -23,6 +23,7 @@ html(lang="en")
         link(href="/stylesheets/main.css" rel="stylesheet" type="text/css")
 
     body(style="background-color: #000;")
+        canvas#confetti(style="width: 200px;height:200px")
         script(src="/jquery/jquery.slim.min.js")
         script(src="/bootstrap/js/bootstrap.bundle.min.js")
         script(src="/fontawesome/js/all.js")