diff --git a/app/assets/stylesheets/common/admin/customize.scss b/app/assets/stylesheets/common/admin/customize.scss
index c68f895b6a2..e9f8fc23e2a 100644
--- a/app/assets/stylesheets/common/admin/customize.scss
+++ b/app/assets/stylesheets/common/admin/customize.scss
@@ -787,6 +787,6 @@
   .robots-txt-input {
     width: 100%;
     box-sizing: border-box;
-    height: 600px;
+    height: 55vh;
   }
 }