How to set image height 90 % of whole page height (not viewport)

Tags: jquery,css

Problem :

I have a bootstrap page and in it I'm loading an image which is over the content and it needs to be height: calc(page height - 150 px) how I would achieve something like that? It's a WordPress bootstrap template. Thanks a lot for your help!

Thanks a lot. Sample HTML code:

<div class="container-fluid" id="uvod">
<img src="img/zirafa.png" class="zirafa" />
    <div class="row clearfix uvod silver"><div class="container">
        <div class="col-md-12 column">
            <div class="text-center"><h2>HEADER 2</h2></div>
            <div class="text">Some text goes here.</div>


img.zirafa {
  width: 100px;
  position: absolute;
  left: 20px;
  z-index: 100;
  top: 100px;
  /*height: 2950px;*/
  width: auto;

Edit: As the giraffe here (my site) - it should be from the top to the bottom.

Solution :

you may do :

$(window).load(function () {
$(window).resize(function () {
var sizeImg = function () {
    var imgH = $(document).height();
    $('img.zirafa').css('height', imgH * 0.9 - 150 + "px");

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