body {
  background: #0a0a0a;
  color: #e0e0e0;
  font-family: Arial, sans-serif;
  text-align: center;
  padding: 20px;
}
.container {
  background: #1a1a1a;
  border-radius: 20px;
  padding: 20px;
  display: inline-block;
  box-shadow: 0 0 20px rgba(255,255,255,0.1);
}
h1, h2 { color: #00ffaa; }
p { font-size: 1.1em; }
canvas { margin: 20px auto; display: block; }