CSS code for setting custom image to a payment method in OnPay form

code.html

<style>
.payment_method_label .logo.billplz {
    background-image: url(//s28.postimg.org/lr4960ft9/billplz-demo.jpg);
    background-size: auto;
    background-position: 0;
    width: 318px;
    height: 158px;
}
</style>