$defaults = array(
    'default-color'          => '',
    'default-image'          => '',
    'default-repeat'         => 'no-repeat',
    'default-position-x'     => 'center',
        'default-position-y'     => 'fixed',
        'default-size'           => 'fixed',
    'default-attachment'     => 'scroll',
    'wp-head-callback'       => '_custom_background_cb',
    'admin-head-callback'    => '',
    'admin-preview-callback' => ''
);
add_theme_support( 'custom-background', $defaults );

/* parallax */   #home {
  background: url(<?php get_background_image(); ?>) no-repeat center center fixed;
  display: table;
  height: 100%;
  position: relative;
  width: 100%;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}