body, html {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #222;
}

canvas {
  display: block;
  background: black;
  cursor: crosshair;
}

#toolbar {
  position: absolute;
  top: 10px;
  left: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  z-index: 10;
}

button, input[type="color"], input[type="range"], input[type="file"] {
  height: 30px;
  cursor: pointer;
}