UX: Use height relative to the viewport for robots.txt textarea

UX: Use height relative to the viewport for robots.txt textarea

diff --git a/app/assets/stylesheets/common/admin/customize.scss b/app/assets/stylesheets/common/admin/customize.scss
index c68f895..e9f8fc2 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;
   }
 }

GitHub sha: 8a525caf