* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  text-align: center;
  margin: 0;
  padding: 20px;
  background-color: #f4f4f9;
  color: #333;
}

header {
  background-color: #007BFF;
  color: white;
  padding: 20px 0;
  margin-bottom: 20px;
}

main {
  margin: 0 auto;
  max-width: 800px;
  padding: 20px;
}

canvas {
  margin: 20px auto;
  display: block;
}

footer {
  margin-top: 20px;
  font-size: 0.9em;
  color: #666;
  border-top: 1px solid #ccc;
  padding-top: 10px;
}