html,
body {
  position: fixed;
  top: 0px;
  left: 0px;
  height: 100%;
  width: 100%;
  background: #ffffff;
  /* background: radial-gradient(at center, #28c7ba, #1a867d); */
}

#particles-js {
  background-size: cover;
  background-position: 50% 50%;
  background-repeat: no-repeat;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 999;
}