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

body {
  overflow: hidden;
  background: #000;
  font-family: 'Segoe UI', sans-serif;
}

#gameCanvas {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
}

#ui-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#ui-layer > * {
  pointer-events: auto;
}