body {
  margin: 0;
  font:
    normal 75% Arial,
    Helvetica,
    sans-serif;
}

canvas {
  display: block;
  vertical-align: bottom;
}

#particles-js {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: #000000;
  background-image: url("");
  background-repeat: no-repeat;
  background-size: 20%;
  background-position: 50% 50%;
}