Ruby on Rails

I'm trying to right align a <ul> in my navbar but it doesn't right align, it's left aligned

<nav class="navbar navbar-expand-lg navbar-light bg-light">
     <% blog_logo=@blog.pictures.where('designation=?', 'blog_logo').first %>

<img src="<%= blog_logo.name %>" height=100 class="navbar-brand logo"><%= @blog.title %>
   
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">

    <ul class = "nav navbar-nav navbar-right">
            <% if user_signed_in? %>
                  <li class="nav-item dropdown">
                      <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
                          <%= current_user.name %>
                      </a>
                    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                          <%= link_to (t 'main_site'), "http://www.#{request.domain}" %>
                          <%= link_to (t 'sign_out'), destroy_user_session_path, method: :delete %>
                    </div>
                   </li>
                  <li class="nav-item">
                  </li>
            <% else %>
                  <li class="nav-item">
                    <%= link_to (t 'sign_in'), new_user_session_path %>
                  </li>
            <% end %>
            <% if admin_signed_in? %>
                     <li><%= link_to current_admin.name, administration_path,  class: "nav-item" %>
            <% end %>
    </ul>
  </div>
</nav>