.circles {
    position: absolute;
    background-color: rgb(23, 23, 23);
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.circles li {
    position: absolute;
    display: block;
    list-style: none;
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    animation: animate 25s linear infinite;
    bottom: -150px;
}

.circles li:nth-child(1) {
    left: 25%;
    width: 80px;
    height: 100px;
    animation-delay: 0s;
}


.circles li:nth-child(2) {
    left: 10%;
    width: 20px;
    height: 25px;
    animation-delay: 2s;
    animation-duration: 12s;
}

.circles li:nth-child(3) {
    left: 70%;
    width: 20px;
    height: 25px;
    animation-delay: 4s;
}

.circles li:nth-child(4) {
    left: 40%;
    width: 60px;
    height: 75px;
    animation-delay: 0s;
    animation-duration: 35s;
}

.circles li:nth-child(5) {
    left: 65%;
    width: 20px;
    height: 25px;
    animation-delay: 0s;
}

.circles li:nth-child(6) {
    left: 75%;
    width: 110px;
    height: 135px;
    animation-delay: 3s;
}

.circles li:nth-child(7) {
    left: 35%;
    width: 120px;
    height: 140px;
    animation-delay: 8s;
}

.circles li:nth-child(8) {
    left: 50%;
    width: 25px;
    height: 38px;
    animation-delay: 15s;
    animation-duration: 55s;
}

.circles li:nth-child(9) {
    left: 20%;
    width: 15px;
    height: 20px;
    animation-delay: 2s;
    animation-duration: 45s;
}

.circles li:nth-child(10) {
    left: 85%;
    width: 150px;
    height: 180px;
    animation-delay: 0s;
    animation-duration: 15s;
}



@keyframes animate {

    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 0.3;
        border-radius: 0;
    }

    100% {
        transform: translateY(-1400px) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
    }

}