const expandBtn = document.getElementById('expandNavbarBtn');
const sidebarElem = document.getElementsByClassName('sidebar')[0];

expandBtn.classList.remove('hidden');
sidebarElem.classList.add('sidebar-hidden');

expandBtn.onclick = function() {
	sidebarElem.classList.toggle('sidebar-hidden');

	if (sidebarElem.classList.contains('sidebar-hidden')) {
		expandBtn.src = '/img/layout-navbar-expand-tabler.svg';
	}
	else {
		expandBtn.src = '/img/layout-navbar-collapse-tabler.svg';
	}
}