/* Force hide Discover and Amex logos regardless of theme */
img[alt*="Discover"], 
img[alt*="American Express"], 
img[alt*="Amex"],
img[src*="discover"], 
img[src*="amex"],
.paymentLogos img[src*="diners"] {
    display: none !important;
    visibility: hidden !important;
    width: 0 !important;
}