Collapse

		
var acc = document.getElementsByClassName("accordion");
		var i;

		for (i = 0; i < acc.length; i++) {
		  acc[i].addEventListener("click", function() {
			this.classList.toggle("active");
			var panel = this.nextElementSibling;
			if (panel.style.maxHeight){
			  panel.style.maxHeight = null;
			} else {
			  panel.style.maxHeight = panel.scrollHeight + "px";
			} 
		  });
		}