https://kontroll.hu/script/500-page.js

1$('#error_500_page').mousemove(function (event) {
2  const isDesktop = window.innerWidth >= 1024;
3
4  if (isDesktop) {
5    var e = $('.eye');
6    var x = (e.offset().left) + (e.width() / 2);
7    var y = (e.offset().top) + (e.height() / 2);
8    var rad = Math.atan2(event.pageX - x, event.pageY - y);
9    var rot = (rad * (180 / Math.PI) * -1) + 180;
10
11    e.css({
12      '-webkit-transform': 'rotate(' + rot + 'deg)',
13      'transform': 'rotate(' + rot + 'deg)'
14    });
15  }
16});