angieps

Looks like I had the same issue as gymreading.

My key was somehow copied incorrectly. Once I re-copied and made sure that the code was correct. It started working!

same results with html body

I did that, deleted everything and only left

/*
 Theme Name:   Twenty Eleven Child
 Theme URI:    https://example.com/twenty-fifteen-child/
 Description:  Twenty eleven Child Theme
 Author:       John Doe
 Author URI:   https://example.com
 Template:     twentyeleven
 Version:      1.0.0
 License:      GNU General Public License v2 or later
 License URI:  https://www.gnu.org/licenses/gpl-2.0.html
 Tags:         light, dark, two-columns, right-sidebar, responsive-layout, accessibility-ready
 Text Domain:  twenty-eleven-child
*/

body {
    background: #ff0000;
}

nothing changes

I made these changes that I thought would be drastic and noticeable but I have not been able to see them in the live preview

body {
background: #ff0000;

#page {
margin: -10em auto;
max-width: 1600px;

twentyeleven-child

my site is
https://uncommoncoffeeroasters.com

but the child theme is not live.