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HTML

CSS

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HTML

              
                <div id="wapper">
  <div id="marker"></div>
  <div id="child">
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce eu dui pulvinar, faucibus leo quis, congue metus. Vestibulum in eleifend metus, eu auctor leo. Donec iaculis massa neque, eget mollis metus ornare sollicitudin. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Sed vehicula vehicula elit, non ullamcorper mi varius vitae. Etiam cursus nunc non interdum ornare. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    <p>Pellentesque sollicitudin, sem at malesuada venenatis, urna risus accumsan lorem, sit amet sollicitudin nibh risus vitae dui. Vivamus pretium consequat convallis. Aliquam ultrices lacus ut neque mollis, non pellentesque ligula bibendum. Pellentesque varius suscipit rhoncus. Morbi tempus leo a lorem condimentum, at tempus velit vestibulum. Nullam eu tincidunt est, eget iaculis mauris. Duis posuere sit amet nisi vel elementum. Aenean sit amet porttitor nisl. Proin at turpis tincidunt sapien pharetra imperdiet gravida eget lorem. Pellentesque commodo sodales eros sit amet vestibulum. Praesent in sem eget quam venenatis adipiscing vitae aliquet magna. Pellentesque volutpat turpis nibh, at gravida mi gravida id.</p>
  </div>
</div>
              
            
!

CSS

              
                #wrapper
{
  position:relative;
  backgound:grey;
}

#marker
{
  width:5px;
  height:1500px;
  position:absolute;
}
#child
{
  font:16px "Trebuchet MS";
  color:white;
  width:80%;
  left:10%;
  background:blue;
  position:fixed;
  top:150%;
}

#child p
{
  padding:10px;
  margin:0;
}
              
            
!

JS

              
                var centerPoint = ( $(window).height() - $("#child").outerHeight() )/2;

$(window).scroll(function()
{
  if($(this).scrollTop() > 200)
    {
      TweenLite.to("#child", 1, {top:centerPoint});
    }
  else if( $(this).scrollTop() < 200 )
    {
      TweenLite.to("#child", 1, {top:"150%"});
    }
});
              
            
!
999px

Console