web-mtui/style.css

html, body {
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}

canvas {
  box-shadow: 0 0 2px rgba(0, 0, 0, 0.3);
}