:nth-last-child

Since UXP v3.0

Matches only the Nth child from the end. Can use an expression or even or odd.

See: https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-child

Example:

.row:nth-last-child(even) {
    background-color: #E8E8E8; /* color even rows (from the end) */
}