'Why isn't my bootstrap class showing when using the Html.PagedListPager() method

Not sure if my syntax is wrong or if I'm missing something but for some reason, the bootstrap class for pagination isn't showing on my view.

 @Html.PagedListPager(Model.GradeList, page => Url.Action("TranscriptAdmin", new { studentId = Model.StudentId, page }), new PagedListRenderOptions
 {
     UlElementClasses = new List<string> { "pagination" },
     LiElementClasses = new List<string> { "page-item"}
  }) 


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