html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: #181c20; /* Dark background for nice contrast */
}

#particle-canvas {
  display: block;
  position: absolute;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  /* Ensures the canvas fills the window */
}