diff --git a/web/pdf_sidebar.js b/web/pdf_sidebar.js
index ee0cf2fc0..e2c0b201f 100644
--- a/web/pdf_sidebar.js
+++ b/web/pdf_sidebar.js
@@ -34,8 +34,8 @@ const UI_NOTIFICATION_CLASS = "pdfSidebarNotification";
  * @typedef {Object} PDFSidebarElements
  * @property {HTMLDivElement} outerContainer - The outer container
  *   (encasing both the viewer and sidebar elements).
- * @property {HTMLDivElement} viewerContainer - The viewer container
- *   (in which the viewer element is placed).
+ * @property {HTMLDivElement} sidebarContainer - The sidebar container
+ *   (in which the views are placed).
  * @property {HTMLButtonElement} toggleButton - The button used for
  *   opening/closing the sidebar.
  * @property {HTMLButtonElement} thumbnailButton - The button used to show
@@ -79,7 +79,7 @@ class PDFSidebar {
     this.pdfThumbnailViewer = pdfThumbnailViewer;
 
     this.outerContainer = elements.outerContainer;
-    this.viewerContainer = elements.viewerContainer;
+    this.sidebarContainer = elements.sidebarContainer;
     this.toggleButton = elements.toggleButton;
 
     this.thumbnailButton = elements.thumbnailButton;
@@ -369,8 +369,8 @@ class PDFSidebar {
    * @private
    */
   _addEventListeners() {
-    this.viewerContainer.addEventListener("transitionend", evt => {
-      if (evt.target === this.viewerContainer) {
+    this.sidebarContainer.addEventListener("transitionend", evt => {
+      if (evt.target === this.sidebarContainer) {
         this.outerContainer.classList.remove("sidebarMoving");
       }
     });
diff --git a/web/viewer.js b/web/viewer.js
index 56f715ddc..1cc0c497b 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -125,7 +125,7 @@ function getViewerConfiguration() {
     sidebar: {
       // Divs (and sidebar button)
       outerContainer: document.getElementById("outerContainer"),
-      viewerContainer: document.getElementById("viewerContainer"),
+      sidebarContainer: document.getElementById("sidebarContainer"),
       toggleButton: document.getElementById("sidebarToggle"),
       // Buttons
       thumbnailButton: document.getElementById("viewThumbnail"),