canvas {
  width: 100%;
  height: 100%;
  border: 2px solid #000;
  background-color: #000;
  display: block;
}

.overlay {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
}

.overlay.hidden {
  display: none;
}

.title {
  font-size: 72px;
  font-weight: bold;
  color: #fff;
}

.instructions {
  font-size: 24px;
  color: #fff;
  text-align: center;
  line-height: 1.8;
}

.btn {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  color: #fff;
}

.btn-start {
  padding: 16px 32px;
  font-size: 24px;
  background: #27ae60;
}

.btn-restart {
  padding: 12px 24px;
  font-size: 18px;
  background: #3498db;
}

.new-best {
  font-size: 36px;
  font-weight: bold;
  color: gold;
}

.new-best.hidden {
  display: none;
}