1/* use a reusable pseudo element */
2article::after {
3  border: 4px solid transparent;
4  background: var(--my-pointer-tracking-background);
5  mask:
6    linear-gradient(#0000, #0000),
7    linear-gradient(#000, #000);
8  mask-clip: padding-box, border-box;
9  mask-composite: intersect;
10}