body {
  margin: 0;
  background: black;
  overflow: hidden;
}

/* GAME WRAPPER → PERFECT CENTREREN */
#gameWrapper {
  position: relative;
  width: 400px;
  margin: 0 auto;
}

/* CANVAS */
canvas {
  display: block;
  background: black;
}

/* OVERLAY precies over canvas */
#overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex; /* zichtbaar bij start */
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background: rgba(0,0,0,0.6);
  color: white;
  font-size: 40px;
}

#startButton {
  margin-top: 20px;
  font-size: 20px;
  padding: 10px 20px;
}