var cols = document.getElementsByClassName("collapsible");
var i;

for (i = 0; i < cols.length; i++) {
	cols[i].addEventListener("click", function() {
		this.classList.toggle("active");
		// var content = this.nextElementSibling;
		// if (content.style.display === "block") {
		// content.style.display = "none";
		// } else {
		// content.style.display = "block";
		// }
	});
}