css won't' load

Hello. I was notified that the css style sheet I’m usign for my child theme was not loading. i had no idea as the site looked fine to my screen reader and all of my links work. An example is at https://tffppodcast.com/premium and the code for my style sheet is.

[ Moderator Note: Please post code or markup snippets between backticks or use the code button. ]

/*
Theme Name: Twenty Twelve Excerpts
Theme URI: https://wp.me/pIhT9-29u
Description: A child theme of 2012 default WordPress theme using Excerpts instead of full posts.
Author: Zeaks
Author url: https://zeaks.org
Version: 1.0
Tags: black, blue, white, fixed-width, custom-header, theme-options
Template: twentytwelve
*/
@import url('../twentytwelve/style.css');

/* continue reading class */
.continue-reading {

}

/* post thumbnail classes */
.excerpt-thumb {

}
.excerpt-thumb img {

}

It looks right to me. Since I don’t knwo what a back tick is I used the back slash simble instead to highlight the code for the style sheet.

Thanks all and take care.