Sticky

function Example() {
  const BOX_ZINDEX = new FixedZIndex(1);
  const STICKY_ZINDEX = new CompositeZIndex([BOX_ZINDEX]);

  return (
    <Box color="white" height={200} overflow="scroll" tabIndex={0}>
      <Box height={500} marginTop={10}>
        <Box>
          <Sticky top={0}>
            <Box
              alignItems="center"
              color="lightGray"
              display="flex"
              height={40}>
                <Text>This should stick</Text>
            </Box>
          </Sticky>
          <Box marginTop={10} position="relative">
            <Text>Scroll</Text>
            <Text>Keep scrolling</Text>
            <Text>Scroll more</Text>
          </Box>
        </Box>
        <Box>
          <Sticky top={0} zIndex={STICKY_ZINDEX}>
            <Box
              alignItems="center"
              color="lightGray"
              display="flex"
              height={40}
              position="relative"
              zIndex={BOX_ZINDEX}>
                <Text>This should also stick</Text>
            </Box>
          </Sticky>
          <Box marginTop={10}>
            <Text>Still scrolling</Text>
            <Text>Tadaaaaa</Text>
          </Box>
        </Box>
      </Box>
    </Box>
  )
}