mypmpro-element-class-colormag.php

<?php
/**
 * This recipe will add in the necessary classes to PMPro Buttons, ensuring they
 * have the same look & feel as your theme: ColorMag
 *
 * https://wordpress.org/themes/colormag/
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function mypmpro_colormag_classes( $class, $element ){

	if ( in_array( 'pmpro_btn', $class ) ) {
		$class = array();
		$class[] = 'colormag-button';
	}

	return $class;

}
add_action( 'pmpro_element_class', 'mypmpro_colormag_classes', 10, 2 );

This recipe is included in the post on "Using the ColorMag Theme by ThemeGrill with Paid Memberships Pro" at Paid Memberships Pro here: https://www.paidmembershipspro.com/colormag-theme-by-themegrill-paid-memberships-pro/