html {
     width: 100%;
     height: 100%;
 }

body {
    background-color: #243C7C;
    width: 100%;
    height: 100%;
}

#particles-js {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}