How to use the @artsy/palette.Sans.extend function in @artsy/palette

width: 20px;
    height: 20px;
    top: 5px;
  }
`

export const BackgroundOverlay = styled.div`
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 7;
`

export const Button = Sans.extend`
  width: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color 0.15s;
  background: ${color("black10")};
  &:hover {
    color: ${color("purple100")};
  }
`

line-height: 1.1em;
  letter-spacing: -0.035em;
  max-width: 1250px;
  margin: 0 auto 27px auto;
  ${unica("s80", "regular")}

  ${pMedia.md`
    font-size: 60px;
  `}
  ${pMedia.xs`
    font-size: 40px;
    margin-bottom: 15px;
  `}
`

const Deck = Sans.extend`
  margin-bottom: 10px;
`

Further Reading in {vertical.name}
      
    )
  } else {
    return <title size="8">More from Artsy Editorial</title>
  }
}

const RelatedArticlesContainer = styled.div`
  display: flex;
  flex-direction: column;
  max-width: 1250px;
  margin: 40px auto 80px auto;
`

const Title = Sans.extend`
  margin-bottom: 20px;
  ${pMedia.xl`
    margin: 0 20px 30px 40px;
  `};
  ${pMedia.sm`
    margin-left: 20px;
  `};
`
const VerticalSpan = styled.span`
  ${pMedia.sm`
    display: block;
  `};
`
const ArticlesWrapper = styled.div.attrs({})`
  display: flex;
  justify-content: space-between;

flex-direction: column;
  `};
`
const Title = styled.div`
  ${unica("s100")};
  margin-bottom: 75px;
  letter-spacing: -0.035em;
  ${pMedia.xl`
    ${unica("s80")}
  `} ${pMedia.md`
    ${unica("s65")}
  `} ${pMedia.xs`
    ${unica("s45")}
  `};
`
const Deck = Sans.extend`
  max-width: 460px;
  margin-right: 30px;
  ${pMedia.sm`
    margin-bottom: 28px;
  `};
`
const FeatureHeaderContainer = styled.div.attrs({})`
  width: 100%;
  position: relative;
  height: ${props => props.height};

  &[data-type="text"] {
    height: auto;
    ${Title} {
      margin-bottom: 150px;
    }