diff --git a/ami_assets/site.css b/ami_assets/site.css
index bba9325b..9d96a406 100644
--- a/ami_assets/site.css
+++ b/ami_assets/site.css
@@ -1,3 +1,3 @@
 /* Override the margin in the CMS page template for better iframe integration. */
 html body>main#cms-content { margin-bottom: 0; }
-html body>main#cms-content div.container { min-height: 79vh; }
+iframe#upstream-app { min-height: 79vh; }