jfa-go/css/loader.css

.loader {
    height: auto;
    color: rgba(0, 0, 0, 0) !important;
}

.loader .dot {
    --diameter: 0.5rem;
    --radius: calc(var(--diameter) / 2);
    --deviation: 20%;
    height: var(--diameter);
    width: var(--diameter);
    background-color: var(--color-content);
    border-radius: 50%;
    position: absolute;
    left: calc(50% - var(--radius));
    animation: osc 1s cubic-bezier(.72,.16,.31,.97) infinite;
}
.loader.loader-sm .dot {
    --deviation: 10%;
}

@keyframes osc {
    25% {
        left: calc(50% + var(--deviation) - var(--radius));
    }
    75% {
        left: calc(50% - var(--deviation));
    }
    0%, 50%, 100% {
        left: calc(50% - var(--radius));
    }
/*
    0%, 100% {
        left: calc(50% - var(--deviation))
    }
    50% {
        left: calc(50% + var(--deviation) - var(--radius));
    }
    */
}