.bo{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    min-height: 100vh;
    overflow: hidden;
}
.glowing{
    position: relative;
    min-width: 750px;
    height: 750px;
    margin: -150px;
    transform-origin: right;
    animation: colorChange 5s linear 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));
    left: calc(80px * var(--i));
    bottom: 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 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 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 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 3s alternate infinite;
}
.glowing span:nth-child(3n+3){
    animation: animate 8s alternate infinite;
}
@keyframes animate {
    0%{
        transform: rotate(0deg);
    }
    100%{
        transform: rotate(360deg);
    }
}
@keyframes animate-reverse {
    0%{
        transform: rotate(360deg);
    }
    100%{
        transform: rotate(0deg);
    }
}