@Html.Pagedlistpager No Bootstrap

Question

I am building a small project in Asp.net MVC and I need to make use of the X.Pagedlist library, I was able to make the pagination all right, but it is not applying the Bootstrap, which should be standard.

Calling the pagination in the View:

<div class="justify-content-center">
   @Html.PagedListPager(Model, pages => Url.Action("Index", new { pages}))                                
</div>

Controller:

// GET: Produto
public ActionResult Index(int? pages)
{
    int pagNumber = (pages ?? 1);
    var produtos = TodosProdutos.ToPagedList(pages, 9);
    return View(produtos);
}

References from the View:

@using X.PagedList.Mvc;
@model X.PagedList.PagedList<Zeus.Models.Product>

Folder Content:

Pagination is as follows when executing:

Does anyone know what the problem might be?