First

theme/js/custom_scripts.js

@@ -0,0 +1,13 @@
+(function() {
+    function onScroll(e) {
+      var sidebar = document.getElementById('sidebar-container-fixed');  
+      if (window.scrollY > 0) {
+        sidebar.style.width = sidebar.offsetWidth + 'px'
+        sidebar.classList.add('sticky');
+      } else {
+        sidebar.style.width = 'auto'
+        sidebar.classList.remove('sticky');
+      }
+    }
+    document.addEventListener('scroll', onScroll);
+})();