diff --git a/packages/netlify-cms-core/src/components/App/App.js b/packages/netlify-cms-core/src/components/App/App.js
index 0c260b54..8e33b0db 100644
--- a/packages/netlify-cms-core/src/components/App/App.js
+++ b/packages/netlify-cms-core/src/components/App/App.js
@@ -38,6 +38,7 @@ const AppRoot = styled.div`
   width: 100%;
   min-width: 1200px;
   min-height: 100vh;
+  position: relative;
 `;
 
 const AppWrapper = styled.div`