#particle-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}



#particles {
    position: absolute; /* You can remove this line */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1; /* Keep it behind the content */
  }