#particles-js {
    width: 100%;
    height: 130vh;
    position: absolute;
    z-index: 0;
    /* inset: 0; */
    left: 0;
    top: 0;
    right: 0;
    margin: auto;
    opacity: .4;
}
#particles-js-v1 {
    width: 50vw;
    height: 50vh;
    position: absolute;
    opacity: .4;
    left: 0;
    top: 0;
}
#particles-js-v2 {
    width: 50vw;
    height: 50vh;
    position: absolute;
    opacity: .4;
    right: 0;
    top: 0;
}
#particles-js-v3 {
    width: 50vw;
    height: 50vh;
    position: absolute;
    opacity: .4;
    right: 0;
    bottom: 0;
}
#particles-js-v4 {
    width: 50vw;
    height: 50vh;
    position: absolute;
    opacity: .4;
    left: 0;
    bottom: 400px;
}