Grid Row 100% Height

I tried implementing the code below but it didn’t fix the grid thing being 100% of the height.
——

add_action(‘wp_footer’, ‘ava_grid_height’);
function ava_grid_height(){
?>
<script>
(function($){
$(window).resize(function() {
var win = $(window),
calc_height = function() {
var winh = win.height(),
header = $(‘#header’).height(),
title = $(‘.title_container’).height(),
gridh = winh – header – title;

$(‘#custom-grid’).css(‘height’, gridh/1.5 + ‘px’);
}

win.on( ‘resize’, calc_height);
calc_height();
}).resize();
})(jQuery);
</script>
<?php
}