const Box = ({ title, children }) => (
  <div class="box">
    <h4>{title}</h4>
    {children}
  </div>
);

console.log(
  <div>
    <Box title="foo">
      Hello, I am <strong>foo</strong>.
    </Box>
    <Box title="bar">
      Hi! I am <strong>bar</strong>!
    </Box>
  </div>
);