body {
  margin: 0px;
  padding: 0px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: lightgray;
}

#canvas {
  margin-top: 5px;
  padding: 0px;
  background-color: white;
  border: 1px solid gray;
}