message: change tag to is in Swatch
diff: @@ -6,7 +6,7 @@ export default function Swatch({name, index, color}) {
  return (
  <div>
  <div className="m-1 mt-3 p-6" style={{background: color}} />
  - <Heading tag="h3" fontSize={2} px={1}>
  + <Heading is="h3" fontSize={2} px={1}>
  {name}.{index}
  </Heading>
  <Text px={1}>{color}</Text>
  