.coupon{--mask1:radial-gradient(circle at 50% 0%,transparent 0,transparent 5%,#000 0,#000 100%,transparent 0,transparent);--mask2:radial-gradient(circle at 50% 100%,transparent 0,transparent 5%,#000 0,#000 100%,transparent 0,transparent);-webkit-mask-composite:source-in,xor;mask-composite:intersect;-webkit-mask-image:var(--mask1),var(--mask2);mask-image:var(--mask1),var(--mask2);-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat}