diff --git a/src/libsysprof-gtk/style.css b/src/libsysprof-gtk/style.css
index 289c07d0..534a612f 100644
--- a/src/libsysprof-gtk/style.css
+++ b/src/libsysprof-gtk/style.css
@@ -74,6 +74,5 @@ markchart {
 timeruler {
   font-size: 0.833em;
   color: alpha(currentColor, .8);
-  border-bottom: 1px solid @borders;
   background: alpha(@borders, .25);
 }
diff --git a/src/libsysprof-gtk/tests/test-charts.ui b/src/libsysprof-gtk/tests/test-charts.ui
index 616da6d3..da29b73f 100644
--- a/src/libsysprof-gtk/tests/test-charts.ui
+++ b/src/libsysprof-gtk/tests/test-charts.ui
@@ -181,6 +181,9 @@
                   <object class="GtkScrolledWindow">
                     <property name="hscrollbar-policy">never</property>
                     <property name="vexpand">true</property>
+                    <style>
+                      <class name="undershoot-top"/>
+                    </style>
                     <child>
                       <object class="GtkListView">
                         <property name="show-separators">true</property>