diff --git a/packages/system/src/styles/init.css b/packages/system/src/styles/init.css
index 7b716a9d..b9219b65 100644
--- a/packages/system/src/styles/init.css
+++ b/packages/system/src/styles/init.css
@@ -296,6 +296,14 @@
   top: 0;
 }
 
+.xy-flow__viewport-portal {
+  position: absolute;
+  width: 100%;
+  height: 100%;
+  left: 0;
+  top: 0;
+}
+
 .xy-flow__minimap {
   background: var(--xy-minimap-background-color, var(--xy-minimap-background-color-default));