diff --git a/packages/theme-default/src/components/Backdrop.svelte b/packages/theme-default/src/components/Backdrop.svelte
index 3ef562bb..3639bd93 100644
--- a/packages/theme-default/src/components/Backdrop.svelte
+++ b/packages/theme-default/src/components/Backdrop.svelte
@@ -2,6 +2,7 @@
   import { createEventDispatcher } from 'svelte'
 
   export let show = false
+  export let top = 0
   export let zIndex = 900
 
   const dispatcher = createEventDispatcher()