Legacy for PMPro pre-v3.1. Not compatible with PMPro v3.1+. Adds credit card logos and a PayPal logo to the "Select Payment Method" box on membership checkout.

legacy_my_pmpro_payment_method.css

/* CSS Document */
#pmpro_payment_method span a {
	background-position: left bottom;
	background-size: contain;
	background-repeat: no-repeat; 
	display: inline-block;
	margin-left: 1%;
	max-width: 300px;
	padding-bottom: 60px;
	text-align: left;
	width: 90%;
}
#pmpro_payment_method span.gateway_paypalexpress {
	margin: 2em 0 0 0;
}
#pmpro_payment_method span.gateway_authorizenet a, 
#pmpro_payment_method span.gateway_braintree a,
#pmpro_payment_method span.gateway_cybersource a,
#pmpro_payment_method span.gateway_paypal a,
#pmpro_payment_method span.gateway_stripe a, 
#pmpro_payment_method span.gateway_twocheckout a {
	background-image: url(images/pay-with-credit-cards.png);
}
#pmpro_payment_method span.gateway_paypalexpress a {
	background-image: url(images/pay-with-paypal.png);
}
@media (min-width: 769px) {
	#pmpro_payment_method .pmpro_checkout-fields {
		column-gap: 2em;
		display: flex;
		flex-direction: row;
		flex-wrap: wrap;
		width: 100%;
	}
	#pmpro_payment_method span {
		flex: 1;
	}
	#pmpro_payment_method span.gateway_paypalexpress {
		margin-top: 0;
	}
}

This recipe is included in the blog post on "Add Credit Cards and PayPal Logos to Checkout when Using PayPal Gateway or Add PayPal Express Add On" at Paid Memberships Pro here: https://www.paidmembershipspro.com/add-credit-cards-and-paypal-logos-to-checkout-when-using-paypal-gateway-or-add-paypal-express-add-on/