diff --git a/public/style.css b/public/style.css
index bf90d56e0..8b85453ab 100644
--- a/public/style.css
+++ b/public/style.css
@@ -332,7 +332,7 @@ a[href],
   #observablehq-sidebar-toggle:indeterminate::before {
     content: "⟨";
   }
-  #observablehq-sidebar-backdrop {
+  #observablehq-sidebar-toggle:checked ~ #observablehq-sidebar-backdrop {
     display: none;
   }
   #observablehq-sidebar-toggle:checked ~ #observablehq-sidebar,
@@ -345,9 +345,6 @@ a[href],
     padding-left: calc(240px + 3rem);
     padding-right: 1rem;
   }
-  #observablehq-sidebar-toggle:checked ~ #observablehq-sidebar-backdrop {
-    display: none;
-  }
   pre {
     border-radius: 4px;
   }