* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #000;
}
.moon
{
    position: relative;
    width: 300px;
    height: 300px;
}
.moon span {
    position: absolute;
    width: calc(300px + var(--i));
    height: calc(300px + var(--i));
    background: var(--clr);
    border-radius: 50%;
    transform-origin: calc(100px + var(--i));
    animation: animate 5s linear infinite;
    animation-duration: calc(var(--d));
    filter: blur(1px);
}

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

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