@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;
    }
}