diff --git a/src/templates/src/education_article.html b/src/templates/src/education_article.html
index 99d98b9..1d22c7f 100644
--- a/src/templates/src/education_article.html
+++ b/src/templates/src/education_article.html
@@ -74,11 +74,13 @@
         // TOC
         const FUDGE = 100;
         const TOC_TOP_SPACING = 20;
-        document.addEventListener('scroll', () => {
+        function updateTOC() {
             // Stickiness
+            const sidebarWidth = sidebar.clientWidth;
             const stick = window.pageYOffset > sidebar.offsetTop-TOC_TOP_SPACING;
             tocContainer.style.position = stick ? 'fixed' : 'static';
             tocContainer.style.top = `${TOC_TOP_SPACING}px`;
+            tocContainer.style.width = `${sidebarWidth}px`;
 
             // Active items
             let activeEntry = null;
@@ -95,7 +97,9 @@
             if (activeEntry) {
                 activeEntry.link.classList.add('active');
             }
-        });
+        }
+        document.addEventListener('scroll', updateTOC);
+        window.addEventListener('resize', updateTOC);
 
         // Notes
         function toggleNotes() {