<Container>
<Row>
<Col mb="m"><Box bg="black" color="white">auto</Box></Col>
<Col width="contains"><Box bg="black" color="white">contains</Box></Col>
<Col width={1} mb="m"><Box bg="black" color="white">full</Box></Col>
<Col width={.5}><Box bg="black" color="white">half</Box></Col>
<Col width={.5}><Box bg="black" color="white">half</Box></Col>
</Row>
</Container>