PeaceInTheMiddleEast/src/Board/MoveAnimation.css at 0f9093ad76e8da7f958ec40443ac9c971452ba59 · ProLoser/PeaceInTheMiddleEast · GitHub

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.move-animation-overlay {
    position: absolute;
    inset: calc(-1 * var(--board-border, 5vmin));
    pointer-events: none;
    z-index: 10;
    overflow: hidden;
}

.move-animation-piece {
    position: absolute;
    border-radius: 50%;
    animation: slide-piece linear infinite;
}

@keyframes slide-piece {
    /* quick fade-in at source */
    0% {
        transform: translate(0, 0);
        opacity: 0;
    }
    5% {
        transform: translate(0, 0);
        opacity: 0.9;
    }
    /* pause at source */
    12% {
        transform: translate(0, 0);
        opacity: 0.9;
        animation-timing-function: ease-in-out;
    }
    /* arrived at destination */
    38% {
        transform: translate(var(--dx), var(--dy));
        opacity: 0.9;
    }
    /* pause at destination */
    45% {
        transform: translate(var(--dx), var(--dy));
        opacity: 0.9;
    }
    /* fade out */
    50% {
        transform: translate(var(--dx), var(--dy));
        opacity: 0;
    }
    /* snap back invisibly */
    51% {
        transform: translate(0, 0);
        opacity: 0;
    }
    100% {
        transform: translate(0, 0);
        opacity: 0;
    }
}