diff --git a/tracing/tracing/ui/base/drag_handle.html b/tracing/tracing/ui/base/drag_handle.html
index 059f472..d919bbb 100644
--- a/tracing/tracing/ui/base/drag_handle.html
+++ b/tracing/tracing/ui/base/drag_handle.html
@@ -27,7 +27,6 @@ found in the LICENSE file.
       flex: 0 0 auto;
       height: 7px;
       position: relative;
-      z-index: 10;
     }

     :host(.vertical-drag-handle) {
@@ -41,7 +40,6 @@ found in the LICENSE file.
       flex: 0 0 auto;
       position: relative;
       width: 7px;
-      z-index: 10;
     }
     </style>
   </template>
diff --git a/tracing/tracing/ui/side_panel/side_panel_container.html b/tracing/tracing/ui/side_panel/side_panel_container.html
index fef3a8a..0f3b521 100644
--- a/tracing/tracing/ui/side_panel/side_panel_container.html
+++ b/tracing/tracing/ui/side_panel/side_panel_container.html
@@ -15,7 +15,6 @@ found in the LICENSE file.
     :host {
       align-items: stretch;
       display: -webkit-flex;
-      z-index: 9;
       background-color: white;
     }

diff --git a/tracing/tracing/ui/timeline_view.html b/tracing/tracing/ui/timeline_view.html
index f0dc001..f302148 100644
--- a/tracing/tracing/ui/timeline_view.html
+++ b/tracing/tracing/ui/timeline_view.html
@@ -89,6 +89,7 @@ found in the LICENSE file.
       display: flex;
       min-height: 0;
       min-width: 0;
+      overflow-x: hidden;
     }

     middle-container ::content track-view-container > * { flex: 1 1 auto; }