body {
  width: 100%;
  height: 100vh;
  margin: 0;
  background: #bcbcbc;
  display: flex;
  justify-content: center;
  align-items: center;
}

#workspace {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.toolbar {
  margin-top: 5mm;
}

#canvas {
  display: block;
  background: #efefef;
}

#canvas.a4-portrait {
  width: 210mm;
  height: 297mm;
  /*   width: calc(210mm / 96 * 72);
  height: calc(297mm / 96 * 72); */
}