body {
  margin: 0;
  overflow: hidden;
  background: #111;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  font-family: sans-serif;
  color: #fff;
}
#gameContainer {
  position: relative;
}
canvas {
  background: #222;
  border: 3px solid #fff;
  display: block;
}
.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 20px;
  text-align: center;
}
button {
  padding: 12px 24px;
  font-size: 18px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: #ff8c00;
  color: #fff;
  transition: transform 0.1s ease;
}
button:active {
  transform: scale(0.95);
}
.diffBtn {
  min-width: 140px;
}
.home-btn {
  position: absolute;
  top: 0;
}

.song-grid {
  grid-template-columns: auto auto auto;
  display: grid;
}