diff --git a/ursine-umbra.scss b/ursine-umbra.scss
index 284609d..900eb63 100644
--- a/ursine-umbra.scss
+++ b/ursine-umbra.scss
@@ -944,6 +944,12 @@ td, th {
       font-family: unquote($header-font);
     }
 
+    @for $i from 1 through 6 {
+      .outline-h#{$i} > .outline-item {
+        padding-left: .75em * ($i - 1);
+      }
+    }
+
     .outline-item:hover {
       background: $sidebar-bg-hover-color;
     }