diff --git a/src/client/tool-iframes.ts b/src/client/tool-iframes.ts
index 1b38b0f..38422e6 100644
--- a/src/client/tool-iframes.ts
+++ b/src/client/tool-iframes.ts
@@ -135,7 +135,7 @@ export function updateToolIframes(
       container.style.top = `${rect.top}px`
       container.style.left = `${rect.left}px`
       container.style.width = `${rect.width}px`
-      container.style.height = '100vh'
+      container.style.height = `calc(100vh - ${rect.top}px)`
     }
     return
   }