Change css for certain user roles

I am trying to do a #tribe_events_event_options{display:none;} for all the author users on my site. I don't want them to be able to set an event to featured, and I thought the simplest way was to not display the box.

Is there an easy way to target user groups for custom css? I've made a author.css file in the child theme folder.

I found this post, but It did not do it for me. Custom CSS In Admin Only For Certain Roles

function wpa66834_role_admin_body_class( $classes ) {
global $current_user;
foreach( $current_user-roles as $role )
    $classes .= ' role-' . $role;
return trim( $classes );
}
add_filter( 'admin_body_class', 'wpa66834_role_admin_body_class' );

Writing css like: example

.role-editor #main-header {display:none;}

But the css is not affected. Am I missing something?

Thanks in advance!