.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: 80px;
            animation-delay: 0s;
        }

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

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

        .circles li:nth-child(4) {
            left: 40%;
            width: 60px;
            height: 60px;
            animation-delay: 0s;
            animation-duration: 18s;
        }

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

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

        .circles li:nth-child(7) {
            left: 35%;
            width: 150px;
            height: 150px;
            animation-delay: 7s;
        }

        .circles li:nth-child(8) {
            left: 50%;
            width: 25px;
            height: 25px;
            animation-delay: 15s;
            animation-duration: 45s;
        }

        .circles li:nth-child(9) {
            left: 20%;
            width: 15px;
            height: 15px;
            animation-delay: 2s;
            animation-duration: 35s;
        }

        .circles li:nth-child(10) {
            left: 85%;
            width: 150px;
            height: 150px;
            animation-delay: 0s;
            animation-duration: 11s;
        }



@keyframes animate {

    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
        border-radius: 0;
    }

    100% {
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
    }
}