@keyframes animate {
    0%{
        top: 0;
        opacity: 0;
    }
    100%{
        top: 100vh;
        opacity: 1;
    }
}

.background {
    position: fixed;
    width: 100vw;
    height: 100vh;
    top: 0;
    left: 0;
    margin: 0;
    padding: 0;
    background: linear-gradient(to top, #358692, #97DFBA);
    overflow: hidden;
}
.background li {
    position: absolute;
    display: block;
    list-style: none;
    width: 10px;
    height: 10px;
    border-radius: 100%;
    background: rgba(255, 255, 255, 0.2);
    animation: animate 19s linear infinite;
}
.background li:nth-child(0) {
    left: 58%;
    width: 112px;
    height: 112px;
    bottom: -112px;
    animation-delay: 1s;
}
.background li:nth-child(1) {
    left: 24%;
    width: 128px;
    height: 128px;
    bottom: -128px;
    animation-delay: 2s;
}
.background li:nth-child(2) {
    left: 24%;
    width: 103px;
    height: 103px;
    bottom: -103px;
    animation-delay: 4s;
}
.background li:nth-child(3) {
    left: 73%;
    width: 103px;
    height: 103px;
    bottom: -103px;
    animation-delay: 8s;
}
.background li:nth-child(4) {
    left: 22%;
    width: 183px;
    height: 183px;
    bottom: -183px;
    animation-delay: 14s;
}
.background li:nth-child(5) {
    left: 4%;
    width: 174px;
    height: 174px;
    bottom: -174px;
    animation-delay: 11s;
}
.background li:nth-child(6) {
    left: 14%;
    width: 164px;
    height: 164px;
    bottom: -164px;
    animation-delay: 18s;
}
.background li:nth-child(7) {
    left: 86%;
    width: 104px;
    height: 104px;
    bottom: -104px;
    animation-delay: 4s;
}
.background li:nth-child(8) {
    left: 78%;
    width: 186px;
    height: 186px;
    bottom: -186px;
    animation-delay: 38s;
}
.background li:nth-child(9) {
    left: 84%;
    width: 187px;
    height: 187px;
    bottom: -187px;
    animation-delay: 13s;
}
.background li:nth-child(10) {
    left: 26%;
    width: 161px;
    height: 161px;
    bottom: -161px;
    animation-delay: 38s;
}
.background li:nth-child(11) {
    left: 28%;
    width: 151px;
    height: 151px;
    bottom: -151px;
    animation-delay: 44s;
}
.background li:nth-child(12) {
    left: 5%;
    width: 112px;
    height: 112px;
    bottom: -112px;
    animation-delay: 40s;
}
.background li:nth-child(13) {
    left: 14%;
    width: 140px;
    height: 140px;
    bottom: -140px;
    animation-delay: 61s;
}
.background li:nth-child(14) {
    left: 17%;
    width: 137px;
    height: 137px;
    bottom: -137px;
    animation-delay: 4s;
}
.background li:nth-child(15) {
    left: 33%;
    width: 192px;
    height: 192px;
    bottom: -192px;
    animation-delay: 6s;
}
.background li:nth-child(16) {
    left: 15%;
    width: 167px;
    height: 167px;
    bottom: -167px;
    animation-delay: 58s;
}
.background li:nth-child(17) {
    left: 31%;
    width: 119px;
    height: 119px;
    bottom: -119px;
    animation-delay: 38s;
}
.background li:nth-child(18) {
    left: 49%;
    width: 134px;
    height: 134px;
    bottom: -134px;
    animation-delay: 12s;
}
.background li:nth-child(19) {
    left: 27%;
    width: 168px;
    height: 168px;
    bottom: -168px;
    animation-delay: 46s;
}
.background li:nth-child(20) {
    left: 17%;
    width: 102px;
    height: 102px;
    bottom: -102px;
    animation-delay: 12s;
}
.background li:nth-child(21) {
    left: 61%;
    width: 139px;
    height: 139px;
    bottom: -139px;
    animation-delay: 93s;
}
.background li:nth-child(22) {
    left: 76%;
    width: 156px;
    height: 156px;
    bottom: -156px;
    animation-delay: 9s;
}
.background li:nth-child(23) {
    left: 18%;
    width: 116px;
    height: 116px;
    bottom: -116px;
    animation-delay: 48s;
}
.background li:nth-child(24) {
    left: 80%;
    width: 160px;
    height: 160px;
    bottom: -160px;
    animation-delay: 57s;
}
.background li:nth-child(25) {
    left: 16%;
    width: 181px;
    height: 181px;
    bottom: -181px;
    animation-delay: 16s;
}
.background li:nth-child(26) {
    left: 4%;
    width: 105px;
    height: 105px;
    bottom: -105px;
    animation-delay: 65s;
}
.background li:nth-child(27) {
    left: 89%;
    width: 140px;
    height: 140px;
    bottom: -140px;
    animation-delay: 23s;
}
.background li:nth-child(28) {
    left: 82%;
    width: 185px;
    height: 185px;
    bottom: -185px;
    animation-delay: 73s;
}
.background li:nth-child(29) {
    left: 63%;
    width: 194px;
    height: 194px;
    bottom: -194px;
    animation-delay: 25s;
}
.background li:nth-child(30) {
    left: 22%;
    width: 190px;
    height: 190px;
    bottom: -190px;
    animation-delay: 147s;
}
.background li:nth-child(31) {
    left: 74%;
    width: 124px;
    height: 124px;
    bottom: -124px;
    animation-delay: 26s;
}
.background li:nth-child(32) {
    left: 47%;
    width: 145px;
    height: 145px;
    bottom: -145px;
    animation-delay: 149s;
}
.background li:nth-child(33) {
    left: 2%;
    width: 197px;
    height: 197px;
    bottom: -197px;
    animation-delay: 65s;
}
.background li:nth-child(34) {
    left: 54%;
    width: 193px;
    height: 193px;
    bottom: -193px;
    animation-delay: 108s;
}
.background li:nth-child(35) {
    left: 54%;
    width: 148px;
    height: 148px;
    bottom: -148px;
    animation-delay: 60s;
}
.background li:nth-child(36) {
    left: 38%;
    width: 110px;
    height: 110px;
    bottom: -110px;
    animation-delay: 52s;
}
.background li:nth-child(37) {
    left: 35%;
    width: 132px;
    height: 132px;
    bottom: -132px;
    animation-delay: 56s;
}