diff --git a/packages/notebook-extension/style/base.css b/packages/notebook-extension/style/base.css
index 1dd539e41..d24fa70c6 100644
--- a/packages/notebook-extension/style/base.css
+++ b/packages/notebook-extension/style/base.css
@@ -64,6 +64,8 @@
   font-family: var(--jp-ui-font-family);
   line-height: calc(1.5 * var(--jp-private-title-panel-height));
   text-overflow: ellipsis;
+  overflow: hidden;
+  white-space: nowrap;
 }
 
 #jp-title h1:hover {
@@ -79,6 +81,8 @@
   font-family: var(--jp-ui-font-family);
   line-height: calc(1.5 * var(--jp-private-title-panel-height));
   text-overflow: ellipsis;
+  overflow: hidden;
+  white-space: nowrap;
 }
 
 @media only screen and (max-width: 760px) {