Firebug is amazing, isn’t it? Glad you’re all set and glad you found a good tutorial.
If you want to learn more about making CSS changes to your site, you might like these tutorials from WordPress.com. They don’t talk about child themes since that’s not something you can do on WordPress.com, but the CSS information is all relevant and you might find it helpful.
https://dailypost.wordpress.com/2013/07/25/css-selectors/
https://dailypost.wordpress.com/2013/06/21/css-intro/
https://dailypost.wordpress.com/2013/08/29/css-matched-rule-pane/
https://en.support.wordpress.com/custom-design/how-to-find-your-themes-css/
https://en.support.wordpress.com/custom-design/css-basics/
These child-theme tutorials may also be helpful:
https://op111.net/53/
https://vimeo.com/39023468
I took a look at your child theme’s stylesheet and just wanted to point out a couple of things:
/*
Theme Name: Singl Child
Theme URI: https://pandoraslunchbox.eu/themes/singl
Description: Singl Child Theme
Author: Jo Blick
Author URI: https://pandoraslunchbox.eu
Template: singl
Version: 1.0.0
*/
@import url('../singl/style.css');
/*
}
----------------------------------- */.page-header, .page-content, .hentry {
background: none repeat scroll 0 0 rgba(0, 0, 0, 0);
box-sizing: border-box;
margin: 0 auto 40px;
padding: 40px 40px 20px;
position: relative;
width: 720px;
}
/* Remove Background & Header Page ID=89 */
body.page-id-89 {background: #ffffff;}
body.page-id-89 div#imagecontainer {display: none;}
----------------------------------- */
The characters /* indicate the beginning of a code comment, while */ indicates the end of a comment. Anything in between these tags does not get applied to your site.
So these lines can be removed:
/*
}
----------------------------------- */
That’s just below
@import url('../singl/style.css');
This line at the end can also be removed as it’s not doing anything, it’s a stray closing comment tag.
----------------------------------- */
Good luck with your theme.