Make responsive navbar dropdown - html

Question

I want to make responsive navbar dropdown that when the website open in mobile the dropdown menu full screen. But when i try to make it to the right with "right: 0" it just go to the right of the toogle button. How to make it go to the right of screen and full screen?. I am use 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 -->
The Picture

Answer 1

If I understood you correctly, these tips may help:
To make dropdown-menu attached right, you can add the following lines to your style:
.dropdown-menu {
top: calc(2em + 2rem + 2px) !important;
right: 0 !important;
}
.nav-item, .btn-group>.btn, .navbar, div.justify-content-end.custom-grup-tombol {
position: static !important;
}
Also, I recommend you to break a line of the dropdown-items with long text by adding
.dropdown-item {
white-space: normal;
}