bitforum-backend/Admin/Pages/Shared/Config/_navTabs.cshtml

<ul class="nav nav-tabs">
    <li class="nav-item">
        <a class="nav-link @Html.IsActive("/Config/Basic")" asp-page="/Config/Basic">기본</a>
    </li>
    <li class="nav-item">
        <a class="nav-link @Html.IsActive("/Config/Images")" asp-page="/Config/Images">이미지</a>
    </li>
</ul>