* {
    margin: 0;
    padding: 0;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    min-height: 100vh;
    background: #000;
    overflow: hidden;
}

.glowing {
    position: relative;
    min-width: 750px;
    height: 750px;
    margin: -150px;
    transform-origin: left;
    animation: colorChange 5s liner infinite;
}

    .glowing:nth-child(even) {
        transform-origin: left;
    }

@keyframes colorChange {
    0% {
        filter: hue-rotate(0deg);
        transform: rotate(0deg);
    }

    100% {
        filter: hue-rotate(360deg);
        transform: rotate(360deg);
    }
}

.glowing span {
    position: absolute;
    top: calc(80px*var(--i));
    bottom: calc(80px*var(--i));
    left: calc(80px*var(--i));
    right: calc(80px*var(--i));
}

    .glowing span:before {
        content: "";
        position: absolute;
        top: 50%;
        left: -8px;
        width: 15px;
        height: 15px;
        background: #f00;
        border-radius: 50%;
    }

    .glowing span:nth-child(3n + 1):before {
        background: rgba(134,255,0,1);
        box-shadow: 0 0 20px rgba(134,255,0,1),0 0 40px rgba(134,255,0,1),0 0 60px rgba(134,255,0,1),0 0 80px rgba(134,255,0,1),0 0 0 8px rgba(134,255,0,.1);
    }

    .glowing span:nth-child(3n + 2):before {
        background: rgba(255,214,0,1);
        box-shadow: 0 0 20px rgba(255,214,0,1),0 0 40px rgba(255,214,0,1),0 0 60px rgba(255,214,0,1),0 0 80px rgba(255,214,0,1),0 0 0 8px rgba(255,214,0,.1);
    }

    .glowing span:nth-child(3n + 3):before {
        background: rgba(0,226,255,1);
        box-shadow: 0 0 20px rgba(0,226,255,1),0 0 40px rgba(0,226,255,1),0 0 60px rgba(0,226,255,1),0 0 80px rgba(0,226,255,1),0 0 0 8px rgba(0,226,255,.1);
    }

    .glowing span:nth-child(3n + 1) {
        animation: animate 10s alternate infinite;
    }

    .glowing span:nth-child(3n + 2) {
        animation: animate-reverse 10s alternate infinite;
    }

    .glowing span:nth-child(3n + 3) {
        animation: animate-reverse 8s alternate infinite;
    }

@keyframes animate {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

@keyframes animate-reverse {
    0% {
        transform: rotate(360deg);
    }

    100% {
        transform: rotate(0deg);
    }
}