canvas {
  width: 100vw;
  height: 100vh;
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  z-index: -9999;
} 

/* ---- particles.js container ---- */
 
 #particles-js{ 
 position:absolute; 
 width: 100%; 
 height: 100%; 
}