body {
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 30px;
}

canvas {
  border: 1px solid #000;
  background: black;
}

.buttons {
  margin-top: 20px;
}

button {
  margin: 5px;
  padding: 8px 15px;
  font-size: 16px;
  cursor: pointer;
}