<ThemeProvider>
  <div style={{ padding: '16px' }}>
    <Select isFullWidth>
      <Flex value="foo">foo</Flex>
      <Flex value="bar">bar</Flex>
    </Select>
    <br />
  </div>
</ThemeProvider>

<ThemeProvider>
  <div style={{ padding: '16px' }}>
    <SelectWithFiltering>
      <Flex value="foo">foo</Flex>
      <Flex value="bar">bar</Flex>
    </SelectWithFiltering>
    <br />
  </div>
</ThemeProvider>