My menus look like this: enter image description here

For background: This is Drupal 8. The menus were fine, but I'm porting the site to Pantheon. My Browser dev tools say that all my files (inc. CSS/JS) are loading properly. There are no JS console errors. My non-Pantheon site doesn't have this behavior, though I've had to make changes to the site to make it work in Pantheon (mainly in Composer) but I can't think of what else could cause this.

Edit: I compared the actual CSS files - builder.css is different on my non-Pantheon site.

1 Answer 1


This is a symptom of missing the bower_components folder, which should be in your CiviCRM module's root folder.

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