我想使响应导航栏下拉，当网站在移动打开下拉菜单全屏。 但是当我用“right:0”把它弄到右边的时候，它就会到togle按钮的右边。 如何使它到屏幕的右边和全屏？。 我正在使用Bootstrap 4

<!-- Grup Tombol -->
<div class="col-6 col-sm-3 col-md-3 col-lg-2 d-flex align-items-center justify-content-end custom-grup-tombol">
  <div class="row">
    <!-- Chat -->
    <div class="nav-item btn-group pl-1 ">
      <button type="button" class="btn btn-info btn-block rounded" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
        <i class="far fa-comments"></i>
      </button>
      <div class="dropdown-menu dropdown-menu-right">
        <button class="dropdown-item" type="button">Action</button>
        <button class="dropdown-item" type="button">Another action</button>
        <button class="dropdown-item" type="button">Something else here</button>
      </div>
    </div>
    <!-- End Chat -->
    <!-- Notif -->
    <div class="nav-item btn-group pl-1 ">
      <button type="button" class="btn btn-info btn-block rounded" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
        <i class="fas fa-bell"></i>
      </button>
      <div class="dropdown-menu dropdown-menu-right">
        <button class="dropdown-item" type="button">Lorem ipsum dolor sit amet consectetur adipisicing elit.</button>
        <button class="dropdown-item" type="button">Another action</button>
        <button class="dropdown-item" type="button">Something else here</button>
      </div>
    </div>
    <!-- End Notif -->
    <!-- User-->
    <div class="nav-item btn-group pl-1 ">
      <button type="button" class="btn btn-info btn-block rounded" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
        <i class="fas fa-user-circle"></i>
      </button>
      <div class="dropdown-menu dropdown-menu-right">
        <button class="dropdown-item" type="button">Action</button>
        <button class="dropdown-item" type="button">Another action</button>
        <button class="dropdown-item" type="button">Something else here</button>
      </div>
    </div>
  <!-- End User--> 
  </div>           
</div>
<!-- END Grup Tombol -->

这幅画