html,
body {
  box-sizing: border-box;
  margin: 0;
  height: 100%;
  background: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: sans-serif;
}

.image-container {
  display: flex;
  height: 100%;
  width: 100%;
  max-width: 100%;
  position: relative;
}

.canvas {
  width: auto;
  max-height: 100%;
  max-width: 100%;
  display: block;
  margin: auto;
}