body {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: sans-serif;
  background-color: #111;
  color: white;
  margin: 0;
  padding: 10px;
}

.menu {
  margin-bottom: 10px;
}

.modo {
  padding: 10px 20px;
  margin: 5px;
  font-size: 16px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  color: white;
}

.rojo {
  background-color: #e53935;
}

.verde {
  background-color: #43a047;
}

canvas {
  background-color: #222;
  border: 2px solid #fff;
}

.marcadores {
  margin-bottom: 10px;
  font-size: 18px;
}