.area {
    position: fixed;
    top: -50px;
    left: 0;
    width: 100%;
    height: calc(100% + 50px);
    z-index: -1;
    background: #8c52ff;
    overflow: hidden;
}

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

.circles li {
    position: absolute;
    display: block;
    list-style: none;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 50%;
}

.static-circle {
    animation: none;
    opacity: 0.5;
}

.moving-circle {
    animation: animate 25s linear infinite;
}

@keyframes animate {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0.2;
    }
}