How to prevent fixed button from overlapping footer area and stop the button on top of where the footer is located

Question

I am trying to create a button that is fixed on the lower-left side of the screen. I tried to setup in JSFiddle to recreate what I\'m trying to do.

Here is my HTML:<

Answer 1

Updated now so that it sticks above footer.

Hope this is what you meant The jQuery:

$(window).scroll(function() {
   if($(window).scrollTop() + $(window).height() > $(document).height() - 200) {
       $('#button').addClass('fixed_button');
   }else{
       $('#button').removeClass('fixed_button');
   }
});

CSS:

.fixed_button{
    position:absolute !important;
    margin-top:1900px;
    bottom: auto !important;
}