diff --git a/src/overrides/Sidebar.astro b/src/overrides/Sidebar.astro
index 920085ede..c0366309b 100644
--- a/src/overrides/Sidebar.astro
+++ b/src/overrides/Sidebar.astro
@@ -63,7 +63,7 @@ const sidebarConfig: [string, boolean, Props][] = Astro.props.sidebar.map(
     cursor: pointer;
     user-select: none;
     margin-bottom: var(--sl-nav-pad-y);
-    width: 100%;
+    size: 100%;
   }
 
   .__collapse > input::after {