diff --git a/docs/.vitepress/theme/custom.css b/docs/.vitepress/theme/custom.css
index d19e4be..3522279 100644
--- a/docs/.vitepress/theme/custom.css
+++ b/docs/.vitepress/theme/custom.css
@@ -180,10 +180,22 @@ html body .VPSidebar > div {
   display: none !important;
 }
 
-/* Keep divider aligned with the actual aside column */
+/* Keep divider aligned with the aside and reach the header */
 @media (min-width: 960px) {
-  .VPDoc.has-aside .aside {
-    border-left: 1px solid var(--vp-c-divider);
+  .VPDoc.has-aside .aside::before {
+    content: '';
+    position: absolute;
+    top: calc(-1 * (var(--vp-doc-top-height, 0px) + 48px));
+    bottom: 0;
+    left: 0;
+    width: 1px;
+    background: var(--vp-c-divider);
+    pointer-events: none;
+  }
+
+  .VPDoc.has-aside .aside.left-aside::before {
+    left: auto;
+    right: 0;
   }
 }