[Theme Horse Support Team]

Hi Laura,

Just try this below code. In style.css add

/*
Theme Name: Interface Pro Child
Theme URI: https://www.themehorse.com/themes/interface-pro
Author: Theme Horse
Author URI: https://www.themehorse.com
Description: Interface Pro is a Simple, Clean and Flat Responsive Retina Ready WordPress Theme. It is easily customizable with numerous theme options. Some of the highlighted options are two site layout (Narrow and Wide), 4 layouts for every post/page, 5 Page Templates, 8 widget areas, 6 custom widgets, featured slider to highlight your post/page, 10 social icons, top and bottom info bar to hightlight your contact/email/location and many more. Also has custom background, header, menu, favicon, CSS, webclip icon, and logo. Supports popular plugins like Breadcrumb NavXT, WP-PageNavi and Contact Form 7. It is also translation ready. Get free support at https://www.themehorse.com/support-forum/ and View beautiful demo site at https://www.themehorse.com/preview/interface-pro
Version: 3.0.2
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Tags: white, light, green, two-columns, left-sidebar, right-sidebar, fluid-layout, custom-menu, custom-background, custom-header, featured-images, full-width-template, theme-options, threaded-comments, translation-ready, sticky-post
Text Domain: interface
Template: interface-pro
*/

and under functions.php add below code

<?php
add_action( 'wp_enqueue_scripts', 'interface_enqueue_styles' );
function interface_enqueue_styles() {
    wp_enqueue_style( 'interface', get_template_directory_uri() . '/style.css' );

}
?>

Thank you!