Hello. I’m having issues with the child theme showing changes on CSS.

I have 2 folders, netelier-2015 and netelier-child-2015. I added 2 new properties for the header class, but I get no effect. What I’m I doing wrong?

http://www.javierpalacios.info

The style.css on the child is as follows:
/*
Theme Name: netelier-child-2015
Theme URI: http://example.com/twenty-fifteen-child/
Description: NETELIER 2015 CHILD
Author: John Doe
Author URI: http://example.com
Template: netelier-2015
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Tags: light, dark, two-columns, right-sidebar, responsive-layout, accessibility-ready
Text Domain: netelier-child-2015
*/

@import url(“../netelier-2015/style.css”);
@import url(“../netelier-2015/skins/grey.css”);

body {
font: 19px/29px “Helvetica Neue”, Helvetica, Arial, sans-serif;
background: #000;
color: #8a8a8a;
}

#header {
background: #000;
box-shadow: 1px 1px 2px 2px rgba(0,0,0,0.1);
}