On the views edit field form (admin/structure/views/view/content > edit any field) The "remove" button should be a "danger" button.
There are three types of buttons supported in core and in the Seven style guide. Standard, primary, and danger.
It's important that the correct button types are used consistently throughout Drupal
Add the button--danger class to the form element, so it looks like a danger button
Beta phase evaluation
|Issue category||Bug because it doesn't meet usability standards|
|Issue priority||Not critical because minor usability issue|
|Unfrozen changes||Unfrozen because it only changes markup/|