Dogeoverlay.js

$(document).ready(function () {
  "use strict";

  var items = Array(
    'such currency',
    'wow',
    'amaze',
    'much coin',
    'awesome',
    'so crypto',
    'how money',
    'plz mine',
    'v rich',
    'many coins',
    'such profit',
    'WOW'
    );

  function addItem() {
    var docHeight = $(document).innerHeight(),
      docWidth = $(document).innerWidth(),
      text = items[Math.floor(Math.random()*items.length)],
      textCol = '#'+Math.floor(Math.random()*16777215).toString(16),
      textSize = Math.floor((Math.random()*48)+12),
      yPos = Math.floor((Math.random()*docHeight)),
      xPos = Math.floor((Math.random()*docWidth));

    $('<div class="bubble" style="' +
      'color:' + textCol + ';' +
      'left:' + xPos + 'px;' +
      'top:' + yPos + 'px;' +
      'position:absolute; ' +
      'z-index:10000; ' +
      'font-size:' + textSize + 'px;' +
      '">' + text + '</div>')
      .appendTo("body")
      .fadeIn('fast')
      .delay(2000)
      .fadeOut('fast');

    $('.bubble:not(:last-child)').remove();
  }

  setInterval(addItem,3000);

});