body {
  margin: 0px;
  padding: 0px;
  height: 100vh; /* Ensure the body takes the full viewport height */
}

canvas {
  display: block;
  margin: 0px;
  width: 100%; /* Ensure the canvas takes the full width of the container */
  height: 100%; /* Ensure the canvas takes the full height of the container */
}

.container{
  margin: 20px;
  height: calc(100vh - 40px); /* Subtract 20px from top and 20px from bottom */
}