html,
body {
    position: fixed;
    top: 0px;
    left: 0px;
    height: 100%;
    width: 100%;
/*    background: #ffffff;
    background: radial-gradient( at center, #28c7ba, #1a867d);*/
    background-color: rgba(60, 91, 147, 0.6);
    background-image: -webkit-linear-gradient(
-410deg
, rgba(61, 66, 96, 0.6) 20%, rgba(21, 23, 34, 0.8));
    background-image: linear-gradient(
140deg
,rgba(61, 66, 96, 0.6) 20%, rgba(21, 23, 34, 0.8));
}

#particles-js {
    background-size: cover;
    background-position: 50% 50%;
    background-repeat: no-repeat;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}