Stylesheet Invicible in Template Editor

I’ve just started with a new theme but the style.css file is empty when I look at it in Theme Editor. In my local text editor it shows and it looks like this:

/*
Theme Name: My Theme
Theme URI: *******
Author: *****
Author URI: ******
Description: My own WordPress Template
Version: 1.0
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: mytheme

*/

/* START */
body { 	background-color:
	font-family: Verdana;
	font-size: 16px; }

	 #wrapper { box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
		margin: 0 auto;
		width: 960px; }

and the header.php finds the stylesheet and uses it when I look at the site in Theme Preview. I can’t figure out what is wrong?