html, body {
  background-color: rgb(50, 50, 50);
  margin: 0;
  padding: 0;
  display: flex;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  overflow: hidden;
}

canvas {
  margin:0;
  padding:0;
  display: block;
}