@media only screen and (max-width: 1200px) {
  #particles-js {
  position: fixed;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, #108c89 0%, #69c0d8 100%);
}
}

@media only screen and (min-width: 1201px) {
  #particles-js {
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, #108c89 0%, #69c0d8 100%);
}
}