functions.php

<?php

if ( ! function_exists( 'yith_pos_customization_css' ) ) {
	add_action( 'wp_enqueue_scripts', 'yith_pos_customization_css', 99 );

	function yith_pos_customization_css() {
		$css = ".yith-pos-product-list__list .product, .yith-pos-product-category-list__list .product-cat{
          height: 150px;
        }";
		wp_add_inline_style( 'yith-pos-frontend', $css );
	}
}