.circles{

    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}



.circles li{

    position: absolute;
    list-style: none;
    width: 20px;
    height: 20px;
    display: block;
    bottom: -150px;
    background-color: #ffffff6e;
    animation: animate 25s linear infinite;
    user-select: none;
}

.circles li:nth-child(1) {
    left: 15%;
    width: 80px;
    height: 80px;
    animation-delay: 0s;
    animation-duration: 12s;
}

.circles li:nth-child(2) {
    left: 39%;
    width: 69px;
    height: 69px;
    animation-delay: 2s;
    animation-duration: 17s;
}

.circles li:nth-child(3) {
    left: 35%;
    width: 49px;
    height: 49px;
    animation-delay: 3s;
}

.circles li:nth-child(4) {
    left: 91%;
    width: 37px;
    height: 37px;
    animation-delay: 0s;
    animation-duration: 7s;
}

.circles li:nth-child(5) {
    left: 65%;
    width: 55px;
    height: 55px;
    animation-delay: 1s;
    animation-duration: 9s;
}

.circles li:nth-child(6) {
    left: 5%;
    width: 42px;
    height: 42px;
    animation-delay: 4s;
}

.circles li:nth-child(7) {
    left: 75%;
    width: 60px;
    height: 60px;
    animation-delay: 0.5s;
    animation-duration: 15s;
}

.circles li:nth-child(8) {
    left: 50%;
    width: 25px;
    height: 25px;
    animation-delay: 2.5s;
}

.circles li:nth-child(9) {
    left: 20%;
    width: 90px;
    height: 90px;
    animation-delay: 1.5s;
    animation-duration: 20s;
}

.circles li:nth-child(10) {
    left: 85%;
    width: 30px;
    height: 30px;
    animation-delay: 0.2s;
}

.circles li:nth-child(11) {
    left: 45%;
    width: 70px;
    height: 70px;
    animation-delay: 3.5s;
    animation-duration: 10s;
}

.circles li:nth-child(12) {
    left: 10%;
    width: 50px;
    height: 50px;
    animation-delay: 5s;
}

@keyframes animate {
    0%{

        transform: translateY(0) rotate(0deg);
        opacity: 1;
        border-radius: 0;
    }
    100%{

        transform: translateY(-400px) rotate(720deg);
        opacity: 1;
        border-radius: 50%;
    }
}


@media screen and (max-width: 600px) {

    @keyframes animate {
        0% {
            transform: translateY(-150px) rotate(0deg);
            opacity: 1;
            border-radius: 0;
        }
        100% {
            transform: translateY(-800px) rotate(720deg);
            opacity: 1;
            border-radius: 50%;
        }
    }
}