* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  align-items: center;
  background-color: #000;
  display: flex;
  height: 100vh;
  justify-content: center;
  width: 100vw;
}

canvas {
  border: 1px solid #fff;
  height: 400px;
  width: 400px;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  align-items: center;
  background-color: #080808;
  display: flex;
  height: 100vh;
  justify-content: center;
  width: 100vw;
}

canvas {
  border: 1px solid #444;
  height: 400px;
  width: 400px;
}
Change background color a little bit to more pleasant.
Change background color a little bit to more pleasant.
