Theme Horse

Hi Sarahadams,

Please do create the child theme before customizing the theme.
To create the child theme create a child theme directory (clean-retina-child) under this folder create style.css and paste the below code:

/*
Theme Name: Clean Retina Child
Theme URI: https://www.themehorse.com/themes/clean-retina
Author: Theme Horse
Author URI: https://www.themehorse.com
Version: 2.0.1
Text Domain: cleanretina
Template: clean-retina
*/

@import url("../clean-retina/style.css"); 
@media only screen and (max-width: 767px) {
your custom css goes here
}

Note: Please add your Custom CSS code in above text ‘your custom css goes here’

Thank you!