diff --git a/web/viewer.css b/web/viewer.css
index d5645d1f4..5acca38f9 100644
--- a/web/viewer.css
+++ b/web/viewer.css
@@ -767,9 +767,9 @@ html[dir='rtl'] .toolbarButton.pageDown::before {
 }
 
 #thumbnailView {
-  position: fixed;
+  position: absolute;
   width: 120px;
-  top: 33px;
+  top: 0;
   bottom: 0;
   padding: 10px 40px 0;
   overflow: auto;
@@ -832,9 +832,9 @@ a:focus > .thumbnail > .thumbnailSelectionRing,
 }
 
 #outlineView {
-  position: fixed;
+  position: absolute;
   width: 192px;
-  top: 33px;
+  top: 0;
   bottom: 0;
   padding: 4px 4px 0;
   overflow: auto;