body {
  font-family: verdana;
  text-align: center; 
  background-color: #FEFEFE;
}

canvas {
  display: block;
  background-color: #E0E0E0;
  width: 740px;
  height: 500px;
  margin: auto;
}

#main-section {
  display: flex;
  flex-direction: column;
}