canvas {
  display: block;
  margin: auto;
}

.canvas-wrapper {
  width: 100%;
}

.color-palette-element {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  border: 1px solid black;
  vertical-align: middle;
}

button.color-palette-element {
  outline: none;
  padding: 0;
  appearance: none;
}