Change elem to querySelector not just ID

[Malin88]

Plz, change elem to querySelectorAll instead getElementById. Now I need to init plugin 8 times for each select and if I add another one in the future, than I need modify JS to add them too... so annoying :/

[hunterruth]

@Malin88 - this seems to work for me.

let selectDropdowns = document.querySelectorAll('select');

    selectDropdowns.forEach((dropdown) => {
        new CustomSelect({
            elem: dropdown
        });
    });