body {
  margin: 0;
}
canvas {
  display: block;
  vertical-align: bottom;
}
#particles-js {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: #4b4f54;
  background-image: url("");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: 50% 50%;
}