<div class="list-group w-100">
    <a class="list-group-item">
        <h4>Dashboard</h4>
    </a>
    <a href="admin_artists.php" class="list-group-item">
        Artists
    </a>

    <a href="admin_albums.php" class="list-group-item">
        Albums
    </a>

    <a href="admin_musics.php" class="list-group-item">
        Songs
    </a>
</div>