* {
  box-sizing: border-box;
  font-family: Arial, Helvetica sans-serif;
}
body {
  background-color: #333;
  color: whitesmoke;
  margin: 0%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: fixed;
  height: 100vh;
  width: 100vw;
}

#canvas {
  border-radius: 5px;
  background-color: #f0f0f0;
}