<%= f.text_area :body %>
<textarea rows=""></textarea>
rails generate simple_form:install --bootstrap
<%= simple_form_for @зщые do |f| %>
<%= f.input :body, as: :text %>
<% end %>
<%= bootstrap_form_for(@user) do |f| %>
<%= f.email_field :email %>
<%= f.password_field :password %>
<%= f.check_box :remember_me %>
<%= f.submit %>
<% end %>