$(document).ready(function () {
			$(document).on('mousewheel', function (event) {
				if (event.originalEvent.wheelDelta > 0 || event.originalEvent.detail < 0) {
					// Mouse wheel up
					$('.nav-main, .header__contact').css({
						opacity: '1',
						visibility: 'visible',
						overflow: 'visible',
					});
				} else {
					// Mouse wheel down
					$('.nav-main, .header__contact').css({
						opacity: '0',
						visibility: 'hidden',
						overflow: 'hidden',
					});
				}
			});
		});