Load custom CSS for Membership Checkout page - Paid Memberships Pro

load-custom-css-level-pmpro.php

<?php
/**
 * Load custom CSS on checkout page in Paid Memberships Pro.
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 
 function load_css_for_level_checkout(){

	global $pmpro_pages;
	// Change your membership level ID here.
	if ( is_page( $pmpro_pages['checkout'] ) ) {
		?>
		/* Add Custom CSS below */
		<style type="text/css">
			form.pmpro_form .pmpro_checkout-fields div.pmpro_checkout-field {
				display: inline-block;
				with:49%;
			}
		</style>
		<?php
	}

}
add_action( 'wp_footer', 'load_css_for_level_checkout', 10 );