@*NavTabs*@
<ul class="nav nav-tabs">
    <li class="nav-item">
        <a class="nav-link @Html.IsActive("/Popup/Index")" asp-page="/Popup/Index">팝업 목록</a>
    </li>
    <li class="nav-item">
        <a class="nav-link @Html.IsActive("/Popup/Position")" asp-page="/Popup/Position">팝업 위치</a>
    </li>
</ul>