window.onload = function() {
    $('.clickable-link').click(function() {
        $(this).toggleClass('active');
        $(this).siblings('.sub-menu-collapsable').toggleClass('active');
    });

    $('.sub-menu-collapsable.first-level').mouseenter(function () {
        $(this).siblings('.clickable-link').first('.triangle-with-shadow').addClass('active')
    });
    $('.sub-menu-collapsable.first-level').mouseleave(function () {
        $(this).siblings('.clickable-link').first('.triangle-with-shadow').removeClass('active')
    });
}