/*
Theme Name: JNews - Child Theme
Version: 1.0.0
Theme URI: http://themeforest.net/?ref=jegtheme
Description: A basic starter child theme for customization purpose of JNews theme.
Author: Jegtheme
Author URI: http://themeforest.net/user/jegtheme?ref=jegtheme
Template: jnews
License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
*/

/* ------------------------------------------------------------------------- *
 *  Theme customization starts here
/* ------------------------------------------------------------------------- */

add_filter('autoptimize_filter_css_replacetag','fix_css_replacetag',10,1);
function fix_css_replacetag($replacetag) {
return array("</head>","before");
}

.img {
height: 100%;
}

<div class="jeg_main " style="height: 100%">