<div class="row">
  <div class="col-sm-4 col-sm-offset-4">
    <h1 class="text-center">Log in</h1>
    <hr>
    <%= form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %>
      <div class="form-group">
        <%= f.email_field :email, autofocus: true, placeholder: 'Email Address', class: 'form-control' %>
      </div>

      <div class="form-group">
        <%= f.password_field :password, autocomplete: "off", placeholder: 'Password', class: 'form-control' %>
      </div>

      <% if devise_mapping.rememberable? -%>
        <div class="form-group">
          <%= f.check_box :remember_me %>
          <%= f.label :remember_me %>
        </div>
      <% end -%>

      <div class="form-group">
          <%= f.submit "Log in", class: "btn btn-primary btn-lg", id: "button-color" %>
      </div>
    <% end %>
      <div class="text-center">
        <%= render "devise/shared/links" %>
      </div>
    </div>
</div>


    <h1 class="text-center">Log in</h1>
    <hr>
    <%= form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %>
      <div class="form-group">
        <%= f.email_field :email, autofocus: true, placeholder: 'Email Address', class: 'form-control' %>
      </div>

      <div class="form-group">
        <%= f.password_field :password, autocomplete: "off", placeholder: 'Password', class: 'form-control' %>
      </div>

      <% if devise_mapping.rememberable? -%>
        <div class="form-group">
          <%= f.check_box :remember_me %>
          <%= f.label :remember_me %>
        </div>
      <% end -%>

      <div class="form-group">
          <%= f.submit "Log in", class: "btn btn-primary btn-lg", id: "button-color" %>
      </div>
    <% end %>
      <div class="text-center">
        <%= render "devise/shared/links" %>
      </div>

Remove specific styling on login page
Remove specific styling on login page
