const colors = {
  primary: "#336699",
  secondary: "#cccccc",
  skyBlue: "#3399cc"
}
 
<PaletteLookup palette={colors} />

import designImgUrl from "./design.png"
 
// dimensions, currently required (may be able to extract them in a future release)
const w = 500;
const h = 250;
 
<DiffTool imgUrl={designImgUrl} imgHeight={h} imgWidth={w}>
  <MyComponent />
</Difftool>