diff --git a/boday_it/static/js/base.js b/boday_it/static/js/base.js
index c6d36ba..f19fee3 100644
--- a/boday_it/static/js/base.js
+++ b/boday_it/static/js/base.js
@@ -16,23 +16,35 @@ var Cl = window.Cl || {};
 // #############################################################################
 // BASE
 // istanbul ignore next
-(function ($) {
-    'use strict';
+(function($) {
+  'use strict';
 
-    // shorthand for invoking jQuery(document).ready
-    $(function () {
-        // removes noscript form body and adds print-js
-        if (window.Cl && window.Cl.Utils) {
-            Cl.Utils._document();
-        }
+  // shorthand for invoking jQuery(document).ready
+  $(function() {
+    // removes noscript form body and adds print-js
+    if (window.Cl && window.Cl.Utils) {
+      Cl.Utils._document();
+    }
 
-        // DOCS: https://github.com/burocratik/outdated-browser
-        if (window.outdatedBrowser) {
-            outdatedBrowser({
-                'languagePath': '',
-                'lowerThan': 'boxShadow'
-            });
+    // DOCS: https://github.com/burocratik/outdated-browser
+    if (window.outdatedBrowser) {
+      outdatedBrowser({
+        'languagePath': '',
+        'lowerThan': 'boxShadow'
+      });
+    }
+    // custom functions "botsicode"
+    const backTop = document.querySelector('.list-inline .pull-right'),
+      bodyContainer = document.querySelector('body>div.container'),
+      shBackTop = function() {
+        if (backTop && bodyContainer) {
+          backTop.style.opacity = +(bodyContainer.offsetTop + bodyContainer.getBoundingClientRect().height > window.innerHeight);
         }
-    });
+      };
+    $(window).resize(shBackTop);
+    $(window).scroll(shBackTop);
+    shBackTop();
+
+  });
 
 })(jQuery);