Did you “activated” the child theme from the Themes page?
I tried for the first time, creating a child theme (for Clean Retina) and successfully did so. Here are the steps for record:
1. First I created a directory “clean-retina-child” (name doesn’t matter), in ../wp-content/themes/ directory.
2. Then I made a style.css file in that directory.
3. After that I wrote the following code in a file (which reduces the gaps above header and between header and post):
/*
Theme Name: Clean Retina Child
Theme URI: https://www.ads-software.com/extend/themes/clean-retina
Description: Child theme for the Clean Retina Theme
Author: Vyom
Author URI: https://vineetkumar.me/
Template: clean-retina
Version: 1.0
*/
@import url("../clean-retina/style.css");
@import url("../clean-retina/rtl.css");
/* =Header
----------------------------------------------- */
#branding {
background: url("images/header-bg.jpg");
border-bottom: 1px solid #ddd;
-moz-box-shadow: 0 7px 0 #f3f3f3;
-webkit-box-shadow: 0 7px 0 #f3f3f3;
box-shadow: 0 7px 0 #f3f3f3;
}
.hgroup-wrap {
padding-top: 25px;
padding-bottom: 20px; /* Changed from 45px */
}
.hgroup-wrap a {
display: block;
}
.hgroup-wrap img {
margin-top: 39px;
margin-bottom: 13px;
}
#site-logo {
float: left;
margin-top: 1px; /* Changed from 39 px */
margin-bottom: 1px; /* Changed from 13 px */
}
4. I went to <mysite>/wp-admin/themes.php and changed theme to the theme which I just made, “Clean Retina Child”.
I think you missed 4th step.
PS: This theme rocks btw!! ??