csarti

This works! Thank you!
But, I would like to understand why:

The new style.css file contains:

/*
Theme Name:Twenty Eleven Child
Version: 1.0
Theme URI: http://quirm.net/themes
Description: A basic starter child theme for Twenty Eleven
Author: Mel Pedley
Author URI: http://blackwidows.co.uk
Template: twentyeleven
License: GNU General Public License v2
License URI: http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*/

/* Copyright 2009-2010 Mel P. (email : esmi@quirm.net)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2,
as published by the Free Software Foundation.

You may NOT assume that you can use any other version of the GPL.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA

The license for this software can also likely be found here:
http://www.gnu.org/licenses/gpl-2.0.html
*/

/* Import layout */
@import url(../twentyeleven/style.css);

AND the childtheme folder also contains a functions.php file with just one line of code:
<?php

Why does this work and not the one I had made?

Thank you!!