How to fetch attribute value from database and apply to form

I am trying to get the background-color for forms from the user and storing the value in user_preference table and applying those back-ground color by fetching data from table into the same form.

My forms look like this:

<%= form_for @user_preference do |u|%>
 <p>
    <%= u.label :title %><br>
    <%= u.text_field :title %>
  </p>

  <p>
    <%= u.label :description %><br>
    <%= u.text_field :description %>
  </p>

  <p> <%= u.label :back_ground_color %><br>
    <%= u.select :bgcolor, options_for_select(UserPreference.bgcolor_options) %>
  </p>

  <p>
    <%= u.label :font %><br>
    <%= u.select :font, options_for_select(UserPreference.font_options) %>

  </p>

 <br >
  <p>
    <%= u.submit %>
  </p>
  <div style="<%= 'background-color:#{@user_preference.bgcolor};' %>"</style></div>
  <hr >
<% end %>

Is it the correct way of doing... let me know where I am doing mistake, any help will be appreciated.