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

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background-color: #222;
  color: white;
  font-family: Arial, sans-serif;
}

header {
  text-align: center;
  margin-bottom: 10px;
}

canvas {
  background-color: black;
  border: 2px solid white;
  display: block;
  max-width: 100%;
}