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About the <head>

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CSS

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HTML 

              
                <!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Crowd at a concert Parallax</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container">
        <div id="scene" class='parallax' data-speed="-4">
            <img src="https://ydmitry.ru/upload/blog/crowd/scene.png">
        </div>
        <div id="crowd-first" class='parallax'>
            <img src="https://ydmitry.ru/upload/blog/crowd/crowd-first.png">
        </div>
        <div id="crowd-second" class='parallax' data-speed="-2">
            <img src="https://ydmitry.ru/upload/blog/crowd/crowd-second.png">
        </div>
        <div id="crowd-third" class='parallax' data-speed="-3">
            <img src="https://ydmitry.ru/upload/blog/crowd/crowd-third.png">
        </div>
</div>
  <div class="container">
    <h1>lorem</h1>
    Lorem ipsum dolor sit amet consectetur adipisicing elit. Quidem deleniti et eum perferendis laboriosam odio, totam reiciendis non quasi repudiandae error ab aspernatur odit accusantium placeat laborum debitis nesciunt minima.
    Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos voluptatem modi necessitatibus culpa error molestiae magnam distinctio sed! Consequatur quam enim accusantium nam odio expedita facere debitis optio beatae doloremque.
    Placeat voluptatibus autem dolore numquam sapiente magnam. Doloremque, modi officia, repudiandae dolorem quis, eum illum quaerat distinctio sunt hic ratione mollitia veniam error! Pariatur tempore veritatis cupiditate tenetur, tempora consequuntur!
    Possimus quae omnis quasi tenetur ipsam itaque corrupti tempore ex quia eos ratione neque voluptatum eaque, ut dignissimos ullam aspernatur porro rerum, eligendi cupiditate facilis deleniti? Minima iusto nesciunt ea!
    Aliquam iure dolorem autem officia odit quis cumque nostrum corporis obcaecati, dignissimos provident commodi inventore placeat consectetur beatae quos, id vel at laborum debitis nesciunt. Eius expedita sunt tenetur sequi.
    Quas maxime, architecto enim quam commodi hic odit consectetur sed? Labore magni fuga, consequuntur minus obcaecati autem eaque quia? Suscipit iste harum minus maiores dolores laboriosam sed accusamus cupiditate veniam!
  </div>
</body>

</html>
!

CSS 

              
                * {
    margin: 0;
    padding: 0;
}

body {
    background: #1f2c2c;
    color: #fff;
    font-family: Arial, serif;
}

.container {
    position: relative;
    background: #1f2c2c;
    height: 760px;
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
}

.parallax {
    position: absolute;
}

#scene {
    z-index: 100;
}

#crowd-third {
  z-index: 200;
}

#crowd-second {
  z-index: 300;
}

#crowd-first {
  z-index: 400;
}
!

JS 

              
                $(document).ready(function(){

  var elem = $('.container'),
      pos = elem.offset(),
      elem_left = pos.left,
      elem_top = pos.top,
      elem_width = elem.width(),
      elem_height = elem.height(),
      x_center,
      y_center;


  $('.container').mousemove(function(e){

    x_center = ( elem_width / 2 ) - ( e.pageX - elem_left );
    y_center = ( elem_height / 2 ) - ( e.pageY - elem_top );

    $('.parallax').each(function(){

      var speed = $(this).attr('data-speed'),
          xPos = Math.round(-1*x_center/20*speed),
          yPos = Math.round(y_center/20*speed);

      if (yPos < 0)
        yPos = -2*speed;
     
      $(this).css('transform', 'translate3d('+xPos+'px, '+yPos+'px, 0px)');

        });

    });

});
!
999px

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