Ruby on Rails

I am trying to add bootstrap styling to my rails form_for form. Such
that I can change the button styling and make the from inline. I tried
adding doing something like:

<div class="form-group">
<%= f.submit "Create your account", class: "btn btn-primary" %>
</div>

However, it did not work. Here is my code in my file.

<%= form_for @subscription do |f| %>
<%= f.text_field :email %>
<%= f.submit %>
<% end %>

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