a[href*="booking.com"]::after,
a[href*="getyourguide.com"]::after,
a[href*="getyourguide.de"]::after,
a[href*="guidetoiceland.is"]::after {
    content: " [Partnerlink]";
    color: #de2723;
    font-size: 60%;
    vertical-align: super;
}