body{
    margin: 0;
    padding: 0;
}

#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(117, 114, 113, 0.8) 10%, rgba(40, 49, 77, 0.8) 30%, rgba(29, 35, 71, 0.8) 50%, rgba(19, 25, 28, 0.8) 80%, rgba(15, 14, 14, .8) 100%), url(../image/tumblr_m00c3czJkM1qbukryo1_500.gif);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: 50% 50%;
}