body {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: #f0f0f0;
  font-family: Arial, sans-serif;
}

h1 {
  margin: 20px;
}

#canvas {
  border: 2px solid #333;
  background-color: #cd0000;
  height: 100%;
  width: 100%;
  cursor: crosshair;
}