.trail {
    position: fixed;
    background-color: white;
    border-radius: 50%;
    opacity: 0;
    pointer-events: none;
    width: 20px;
    height: 20px;
    animation: fadeAndShrink 0.5s forwards;
    z-index: 9999;
}

@keyframes fadeAndShrink {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(0);
    }
}