I am building a simple_form in a rails app I am building. I have the bootstrap-sass gem installed and it is working. I am attempting to add bootstrap styles to my form. I've done this before, so I'm a bit confused as to why this is not working. Have I done something wrong? Bootstrap is adjusting my overall div size, but none of the styles for the form get applied. Help would be appreciated.
<%= simple_form_for @album do |f| %>
<div class="form-group">
<%= f.input :title, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.input :artist, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.input :year, class: 'form-control' %>
</div>
<%= f.file_field :cover %>
<br />
<%= f.button :submit %>
<% end %>