diff --git a/app/assets/stylesheets/dialog.css b/app/assets/stylesheets/dialog.css
index 75f03136a..4e10ccabb 100644
--- a/app/assets/stylesheets/dialog.css
+++ b/app/assets/stylesheets/dialog.css
@@ -38,6 +38,6 @@
 
   /* Ensure padding from viewport edges */
   .dialog.panel {
-    max-inline-size: calc(100vw - var(--block-space-double));
+    max-inline-size: calc(100vw - var(--inline-space-double) * 2);
   }
 }