Apply GitLab UI button styles to buttons in app/views/profiles/keys directory

Instructions

For instructions about how to apply GitLab UI button styles to the button instances on these templates, see the epic &4001 (closed).

Files in directory with buttons that needs migration

• app/views/profiles/keys/_form.html.haml
• app/views/profiles/keys/_key.html.haml
• app/views/profiles/keys/_key_details.html.haml