@keyframes spinner-line-fade-more {
    0%, 100% {
        opacity: 0; /* minimum opacity */
    }

    1% {
        opacity: 1;
    }
}

@keyframes spinner-line-fade-quick {
    0%, 39%, 100% {
        opacity: 0.25; /* minimum opacity */
    }

    40% {
        opacity: 1;
    }
}

@keyframes spinner-line-fade-default {
    0%, 100% {
        opacity: 0.22; /* minimum opacity */
    }

    1% {
        opacity: 1;
    }
}

@keyframes spinner-line-shrink {
    0%, 25%, 100% {
        /* minimum scale and opacity */
        transform: scale(0.5);
        opacity: 0.25;
    }

    26% {
        transform: scale(1);
        opacity: 1;
    }
}