.circle {
    position: absolute;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, .1);
    backdrop-filter: blur(5px);
    box-shadow: 0 25px 45px rgba(0, 0, 0, .1);
    border: 1px solid rgba(255, 255, 255, .5);
    border-right: 1px solid rgba(255, 255, 255, .2);
    border-bottom: 1px solid rgba(255, 255, 255, .2);
    border-radius: 100px;
}

.circle:nth-child(1) {
    top: 5px;
    right: 70px;
    width: 43px;
    height: 43px;
}

.circle:nth-child(2) {
    top: 15px;
    right: 410px;
    width: 32px;
    height: 32px;
}

.circle:nth-child(3) {
    top: 8px;
    right: 460px;
    width: 42px;
    height: 42px;
}

.circle:nth-child(4) {
    top: 2px;
    right: 270px;
    width: 60px;
    height: 60px;
}

.circle:nth-child(5) {
    top: 4px;
    right: 170px;
    width: 50px;
    height: 50px;
}

.circle {
    animation: animate 10s linear infinite;
    animation-delay: calc(-1s * var(--i));
}

@keyframes animate {

    0%,
    100% {
        transform: translateY(-40px);
    }

    50% {
        transform: translateY(40px);
    }
}