increase-reading-focus.js

var els = document.querySelectorAll('h1, h2, h3, h4, h5, h6, a, p, div');

function transform() {
  Array.prototype.forEach.call(els, function(p) {
    p.style.transform = 'translateY(' + (Math.random() - 0.5) + 'px)';
  });

  requestAnimationFrame(function() {
    transform();
  });
}

transform();