body {
  margin: 0;
  overflow: hidden;
  font-family: 'Segoe UI', sans-serif;
  background: #000;
  color: white;
  text-align: center;
}
canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 0;
}
.contenido {
  position: relative;
  z-index: 2;
  padding: 20px;
}
#contador {
  font-size: 1.5em;
  margin: 10px 0;
}
.decoracion {
  width: 120px;
  margin-top: 20px;
}