html,
body,
#app {
  min-height: 100%;
  margin: 0;
}

* {
  box-sizing: border-box;
}

.fixed-stage {
  left: 50%;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%) scale(var(--stage-scale, 1));
  transform-origin: center;
}