diff --git a/js/splashify_full_screen.js b/js/splashify_full_screen.js
index ca787d70ac94433cca484d36dc52432d70f8d1c2..bd19925c5406109027fdef800c72df0f3d8724a4 100644
--- a/js/splashify_full_screen.js
+++ b/js/splashify_full_screen.js
@@ -1,54 +1,73 @@
 (function ($) {
-  Drupal.behaviors.splashifyBehavior.full_screen =
-    function (context, settings) {
-      var splash_height = $(window).height();
+  Drupal.behaviors.splashifyBehavior.full_screen = function (
+    context,
+    settings,
+  ) {
+    const splashHeight = $(window).height();
 
-      $('#splashify', context).once('splashify_open').each(function () {
-        var $splash = $(this);
+    // Open the splash div.
+    function openSplash($splash) {
+      const $body = $('body');
+      $body.addClass('splash-active');
+
+      const originalHeight = $splash.attr('originalheight');
+
+      if (originalHeight) {
+        $body[0].style.marginTop = `${originalHeight}px`;
+
+        const splashWrapper = document.querySelector('.splash-wrapper');
+        if (splashWrapper) {
+          splashWrapper.style.height = `${originalHeight}px`;
+        }
+      }
+
+      window.scrollTo(0, 0);
+    }
+
+    $('#splashify', context)
+      .once('splashify_open')
+      .each(function () {
+        const $splash = $(this);
 
         // Get the height of the div. Set it as a custom attribute.
         // Update the height to 0 and then show the div.
-        $('body').css('margin-top', splash_height);
-        $splash.attr('originalheight', splash_height + 'px');
-        $splash.css('position', 'absolute');
-        $splash.css('display', 'block');
+        document.body.style.marginTop = splashHeight;
+        $splash.setAttribute('originalheight', `${splashHeight}px`);
+        $splash.style.position = 'absolute';
+        $splash.style.display = 'block';
 
         // Open the splash.
         openSplash($splash);
 
         // Track scroll position to destroy splash
-        $(context).once('splashify_scroll').on('scroll.splash', function () {
-          var $object = $(this);
-          var scroll_position = $object.scrollTop();
-          if (scroll_position >= splash_height) {
-            $object.scrollTop(0);
-            // Destroy the splash div...they scrolled passed it.
-            var $body = $('body');
-            $body.removeClass('splash-active');
-            $body.css('margin-top', 0);
-            $('#splashify', context).css('height', 0);
-            $object.off('scroll.splash');
-          }
-        });
-      });
+        $(context)
+          .once('splashify_scroll')
+          .on('scroll.splash', function () {
+            const $object = $(this);
+            const scrollPosition = $object.scrollTop();
+            if (scrollPosition >= splashHeight) {
+              $object.scrollTop(0);
+              // Destroy the splash div, they scrolled passed it.
+              const $body = $('body');
+              $body.removeClass('splash-active');
+              $body[0].style.marginTop = '0';
 
-      // Open the splash div.
-      function openSplash($splash) {
-        var $body = $('body');
-        $body.addClass('splash-active');
-        $body.css('margin-top', $splash.attr('originalheight'));
-        $('.splash-wrapper').css('height', $splash.attr('originalheight'));
-        window.scrollTo(0, 0);
-      }
+              const splashify = document.getElementById('splashify');
+              if (splashify) {
+                splashify.style.height = '0';
+              }
 
-      // Close the splash div.
-      function closeSplash() {
-        var $body = $('body');
-        $body.removeClass('splash-active');
-        $body.css('margin-top', 0);
-        $('.splash-wrapper').css('height', 0);
-      }
+              $object.off('scroll.splash');
+            }
+          });
+      });
 
+    // Close the splash div.
+    function closeSplash() {
+      const $body = $('body');
+      $body.removeClass('splash-active');
+      $body[0].style.marginTop = '0';
+      document.querySelector('.splash-wrapper').style.height = '0';
     }
-
+  };
 })(jQuery);
diff --git a/js/splashify_init.js b/js/splashify_init.js
index e129214650a59c69da18fd7098c97694820b465a..d12e8b02396b670f392326a4e574df4fcdadf101 100644
--- a/js/splashify_init.js
+++ b/js/splashify_init.js
@@ -1,27 +1,27 @@
 (function ($) {
   Drupal.behaviors.splashifyBehavior = {
-    attach: function (context, settings) {
-      var jsmode = settings.splashify.mode,
-        referrer = document.referrer + '',
-        hostname = window.location.hostname + '',
-        referrer_check = settings.splashify.referrer_check;
+    attach(context, settings) {
+      const jsmode = settings.splashify.mode;
+      let referrer = `${document.referrer}`;
+      const hostname = `${window.location.hostname}`;
+      const referrerCheck = settings.splashify.referrer_check;
 
-      // This updates the referer string by taking out the url parameter from the
-      // url...which is included from google search results (as an example).
-      if (referrer.indexOf('?') != -1) {
+      // This updates the referer string by taking out the URL parameter from the
+      // URL, which is included from Google search results (as an example).
+      if (referrer.indexOf('?') !== -1) {
         referrer = referrer.substr(0, referrer.indexOf('?'));
       }
-      // Stop the splash page from show up if on the splash page. Also prevent
+
+      // Stop the splash page from showing up if on the splash page. Also prevent
       // the splash from showing up from internal links (dependent on the
       // referrer check settings).
-      if ((referrer.search(hostname) != -1 && referrer_check)) {
+      if (referrer.search(hostname) !== -1 && referrerCheck) {
         return;
       }
 
-      if (typeof Drupal.behaviors.splashifyBehavior[jsmode] != 'undefined') {
+      if (typeof Drupal.behaviors.splashifyBehavior[jsmode] !== 'undefined') {
         Drupal.behaviors.splashifyBehavior[jsmode](context, settings);
       }
-    }
-  }
-
+    },
+  };
 })(jQuery);
diff --git a/js/splashify_lightbox.js b/js/splashify_lightbox.js
index cd3c0a2b01154937ef601854dafa1802e798d658..6b7638b10f291e9788a8175aca2d223c2a32c2d8 100644
--- a/js/splashify_lightbox.js
+++ b/js/splashify_lightbox.js
@@ -1,15 +1,13 @@
 (function ($) {
-  Drupal.behaviors.splashifyBehavior.lightbox =
-    function (context, settings) {
-      var url = settings.splashify.url;
-
-      $.colorbox({
-        transition: 'elastic',
-        iframe: true,
-        href: url,
-        width: settings.splashify.width,
-        height: settings.splashify.height
-      });
-    }
+  Drupal.behaviors.splashifyBehavior.lightbox = function (context, settings) {
+    const url = settings.splashify.url;
 
+    $.colorbox({
+      transition: 'elastic',
+      iframe: true,
+      href: url,
+      width: settings.splashify.width,
+      height: settings.splashify.height,
+    });
+  };
 })(jQuery);
diff --git a/js/splashify_redirect.js b/js/splashify_redirect.js
index de974bd701c83e56a012f011382cb16aad04bba5..93a8f611b6350844485630fe7d09aa015cae1fe7 100644
--- a/js/splashify_redirect.js
+++ b/js/splashify_redirect.js
@@ -1,9 +1,7 @@
 (function ($) {
-  Drupal.behaviors.splashifyBehavior.redirect =
-    function (context, settings) {
-      var url = settings.splashify.url;
-
-      window.location.replace(url);
-    }
+  Drupal.behaviors.splashifyBehavior.redirect = function (context, settings) {
+    const url = settings.splashify.url;
 
+    window.location.replace(url);
+  };
 })(jQuery);
diff --git a/js/splashify_window.js b/js/splashify_window.js
index 1c97502b84fa9ca39929655148741eb7470754cc..cb8aa0711140ca02f6f689f26be366485b180b64 100644
--- a/js/splashify_window.js
+++ b/js/splashify_window.js
@@ -1,9 +1,7 @@
 (function ($) {
-  Drupal.behaviors.splashifyBehavior.window =
-    function (context, settings) {
-      var url = settings.splashify.url;
-
-      window.open(url, 'splash', settings.splashify.size);
-    }
+  Drupal.behaviors.splashifyBehavior.window = function (context, settings) {
+    const url = settings.splashify.url;
 
+    window.open(url, 'splash', settings.splashify.size);
+  };
 })(jQuery);