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Be sure to have a copy of the Bootstrap stylesheet available on your application, you can get it on http://twitter.github.com/bootstrap. Inside your views, use the 'ext_form_for' with one of the Bootstrap horizontal form classes, as the following: = ext_form_for(@user) do |form| Other form class, just use the 'simple_form_for': = simple_form_for(@user, html: {class: 'form-inline'}) do |form|