script.js

const hamburger = document.querySelector('.header .nav-bar .nav-list .hamburger');
const mobile_menu = document.querySelector('.header .nav-bar .nav-list ul');
const menu_item = document.querySelectorAll('.header .nav-bar .nav-list ul li a');
const header = document.querySelector('.header.container');

hamburger.addEventListener('click', () => {
	hamburger.classList.toggle('active');
	mobile_menu.classList.toggle('active');
});

document.addEventListener('scroll', () => {
	var scroll_position = window.scrollY;
	if (scroll_position > 250) {
		header.style.backgroundColor = '#29323c';
	} else {
		header.style.backgroundColor = 'transparent';
	}
});

menu_item.forEach((item) => {
	item.addEventListener('click', () => {
		hamburger.classList.toggle('active');
		mobile_menu.classList.toggle('active');
	});
});

var containerEl = document.querySelector('.grid');

var mixer = mixitup(containerEl);
var headers = document.getElementById("controls");
var btns = headers.getElementsByClassName("control");
for (var i = 0; i < btns.length; i++) {
  btns[i].addEventListener("click", function() {
  var current = document.getElementsByClassName("active");
  current[0].className = current[0].className.replace(" active", "");
  this.className += " active";
  });
}

const inputs = document.querySelectorAll(".input");

function focusFunc() {
  let parent = this.parentNode;
  parent.classList.add("focus");
}

function blurFunc() {
  let parent = this.parentNode;
  if (this.value == "") {
    parent.classList.remove("focus");
  }
}

inputs.forEach((input) => {
  input.addEventListener("focus", focusFunc);
  input.addEventListener("blur", blurFunc);
});