body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: black;
}

.container {
    width: 17em;
    height: 17em;
    font-size: 16px;
    position: relative;
}

.container div {
    position: absolute;
    width: inherit;
    height: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(calc(var(--n) * 40deg));
}

.container div span {
    position: absolute;
    width: 1em;
    height: 1em;
    background-color: hsl(calc(var(--n) * 80), 100%, 70%);
    left: calc(10% - 0.5em);
    --duration: 2s;
    animation: 
        move var(--duration) cubic-bezier(0.6, -0.3, 0.7, 0) infinite,
        morph calc(var(--duration) / 2) ease-in-out infinite;
    animation-delay: calc(var(--duration) / 9 * var(--n) * -1);
}

@keyframes move {
    50% {
        left: calc(90% - 0.5em);
    }
}

@keyframes morph {
    0%, 100% {
        transform: scale(0.75, 1);
    }

    50% {
        transform: scale(1.5, 0.5);
    }
}

.container div:nth-child(1) { --n: 1; }
.container div:nth-child(2) { --n: 2; }
.container div:nth-child(3) { --n: 3; }
.container div:nth-child(4) { --n: 4; }
.container div:nth-child(5) { --n: 5; }
.container div:nth-child(6) { --n: 6; }
.container div:nth-child(7) { --n: 7; }
.container div:nth-child(8) { --n: 8; }
.container div:nth-child(9) { --n: 9; }