/*
    <ul class="circles">
        @for (int i = 0; i < 10; i++)
        {
            var r_Red = 75;
            var r_Green = 75;
            var r_Blue = 75;
            var r_Alpha = 3;

            var colorString = string.Format("background-color: rgba({0}, {1}, {2}, 0.{3});", r_Red, r_Green, r_Blue, r_Alpha);

            <li style="@(colorString)"></li>
        }
    </ul>
*/


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

    .circles li {
        position: absolute;
        display: block;
        list-style: none;
        width: 20px;
        height: 20px;
        animation: animate 25s linear infinite;
        bottom: -150px;
    }

        .circles li:nth-child(1) {
            left: 25%;
            width: 80px;
            height: 80px;
            animation-delay: 8s;
        }


        .circles li:nth-child(2) {
            left: 10%;
            width: 20px;
            height: 20px;
            animation-delay: 3s;
            animation-duration: 12s;
        }

        .circles li:nth-child(3) {
            left: 70%;
            width: 20px;
            height: 20px;
            animation-delay: 6s;
        }

        .circles li:nth-child(4) {
            left: 40%;
            width: 60px;
            height: 60px;
            animation-delay: 5s;
            animation-duration: 18s;
        }

        .circles li:nth-child(5) {
            left: 65%;
            width: 20px;
            height: 20px;
            animation-delay: 7s;
        }

        .circles li:nth-child(6) {
            left: 75%;
            width: 110px;
            height: 110px;
            animation-delay: 8s;
        }

        .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: 5s;
            animation-duration: 35s;
        }

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