<%= simple_form_for [forem, :admin, @category] do |f| %>
  <%= f.input :name %>
  <%= f.submit %>
<% end %>

<%= simple_form_for [forem, :admin, @category] do |f| %>
  <%= f.input :name %>
  <%= f.submit :class => "btn btn-primary" %>
<% end %>

Add btn-primary classes to categories form button
Add btn-primary classes to categories form button
