html, body {
  margin: 0;
  padding: 0;
}

canvas {
  display: block;
  display:flex;
  justify-content: center;
}

#sketch-holder{
  display: flex;
  justify-content: center;
  margin-top: 2em;

}

@media (max-width: 600px ) {
#sketch-holder{
  margin-top: 1em;
  display: flex;
  justify-content: center;

}


}