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

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

.background {
    position: fixed;
    width: 100vw;
    height: 100vh;
    top: 0;
    left: 0;
    margin: 0;
    padding: 0;
    background: #b8c8d1;
    overflow: hidden;
}

    .background li {
        position: absolute;
        display: block;
        list-style: none;
        width: 20px;
        height: 20px;
        background: rgba(255, 255, 255, 0.2);
        animation: animate 19s linear infinite;
    }




        .background li:nth-child(0) {
            left: 22%;
            width: 166px;
            height: 166px;
            bottom: -166px;
            animation-delay: 1s;
        }

        .background li:nth-child(1) {
            left: 86%;
            width: 128px;
            height: 128px;
            bottom: -128px;
            animation-delay: 1s;
        }

        .background li:nth-child(2) {
            left: 25%;
            width: 130px;
            height: 130px;
            bottom: -130px;
            animation-delay: 5s;
        }

        .background li:nth-child(3) {
            left: 20%;
            width: 112px;
            height: 112px;
            bottom: -112px;
            animation-delay: 2s;
        }

        .background li:nth-child(4) {
            left: 41%;
            width: 117px;
            height: 117px;
            bottom: -117px;
            animation-delay: 17s;
        }

        .background li:nth-child(5) {
            left: 65%;
            width: 177px;
            height: 177px;
            bottom: -177px;
            animation-delay: 4s;
        }

        .background li:nth-child(6) {
            left: 65%;
            width: 142px;
            height: 142px;
            bottom: -142px;
            animation-delay: 12s;
        }

        .background li:nth-child(7) {
            left: 77%;
            width: 113px;
            height: 113px;
            bottom: -113px;
            animation-delay: 15s;
        }

        .background li:nth-child(8) {
            left: 69%;
            width: 131px;
            height: 131px;
            bottom: -131px;
            animation-delay: 22s;
        }

        .background li:nth-child(9) {
            left: 30%;
            width: 182px;
            height: 182px;
            bottom: -182px;
            animation-delay: 5s;
        }

        .background li:nth-child(10) {
            left: 49%;
            width: 196px;
            height: 196px;
            bottom: -196px;
            animation-delay: 27s;
        }

        .background li:nth-child(11) {
            left: 29%;
            width: 129px;
            height: 129px;
            bottom: -129px;
            animation-delay: 31s;
        }

        .background li:nth-child(12) {
            left: 8%;
            width: 135px;
            height: 135px;
            bottom: -135px;
            animation-delay: 2s;
        }

        .background li:nth-child(13) {
            left: 23%;
            width: 118px;
            height: 118px;
            bottom: -118px;
            animation-delay: 41s;
        }

        .background li:nth-child(14) {
            left: 87%;
            width: 162px;
            height: 162px;
            bottom: -162px;
            animation-delay: 25s;
        }

        .background li:nth-child(15) {
            left: 1%;
            width: 101px;
            height: 101px;
            bottom: -101px;
            animation-delay: 60s;
        }