Erstelle wp-content/themes/blueprint-child/style.css:

/*
 Theme Name: Blueprint Child
 Theme URI: https://example.com
 Description: Child Theme fuer das Custom Theme von Future Advice GmbH
 Author: Future Advice GmbH
 Author URI: https://future-advice.ch
 Template: blueprint
 Version: 1.0.0
 Text Domain: blueprint-child
*/

html, body {
  overflow-x: hidden;
}