* {
  margin: 0px;
  padding: 0px;
}

html, body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #aaaaaa;
}

canvas {
  margin: 0px auto;
  cursor: pointer;
}