= simple_form_for User.new, :url => user_session_path, html: {class: 'form-horizontal', id: 'sign_in'} do |f|
= f.input_field :email, type: 'email', pattern: '[^@]*@[^@]*', class: 'form-control', required: true, placeholder: 'E-Mail', id: 'signin_email'
.input-group
= f.input_field :password, class: 'form-control', required: true, placeholder: 'Password', id: 'signin_password'
%input.btn.btn-primary{type: 'submit', value: 'Sign In'}