CSS affects plugin page

When this plugin is enabled, the links on plugins.php have additional styling added to them. Activate is green and Deactivate is grey. It doesn’t look bad, but the plugin shouldn’t affect anything outside its remit.

I didn’t use the plugin in the end because the user/email already existed. I was trying to give them admin access for a week. I didn’t see how to edit an existing user without deleting them first.