Zeitfresser-Wordpress-Theme/inc/blocks/font-customization/logo-size/customizer-logo-size.js

jQuery( function( $ ) {

	wp.customize('logo_size',function ( value ) {
		value.bind(function ( to ) {
		        document.body.style.setProperty('--logo-size', to+'px');
		    }
		);
	} );

} );