diff --git a/app/assets/stylesheets/dialog.css b/app/assets/stylesheets/dialog.css
index 632d9af74..75f03136a 100644
--- a/app/assets/stylesheets/dialog.css
+++ b/app/assets/stylesheets/dialog.css
@@ -36,10 +36,8 @@
     }
   }
 
-  /* Ensure padding from viewport edges on narrow screens */
-  @media (max-width: 639px) {
-    .dialog.panel {
-      max-inline-size: 94vw;
-    }
+  /* Ensure padding from viewport edges */
+  .dialog.panel {
+    max-inline-size: calc(100vw - var(--block-space-double));
   }
 }