html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 100%;
  background: black;
  font-family: monospace;
}
canvas {
  position: fixed;
  top: 0;
  left: 0;
}
#matrix {
  z-index: 1;
}
#particles {
  z-index: 2;
}
.centered-text {
  z-index: 3;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #ccf;
  font-size: 3.5rem;
  pointer-events: none;
  text-shadow: 0 0 20px #0ff, 0 0 40px #0ff;
}