body {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  font-family: Arial, sans-serif;
}

.container {
  width: 75%;
}

canvas {
  margin: 20px 0;
  width: 100%;
  height: 400px;
}