title: The Jupyter do not show border lines and grey blocks
body: <p>everybody. I learn NumPy and pandas with the Jupyter. When printing, it does not show borderlines and grey blocks. Example:</p>
  <p><img src="https://i.stack.imgur.com/DEjHv.jpg" alt="actual_result" /></p>
  <p>Should be:</p>
  <p><img src="https://i.stack.imgur.com/B2Ttx.jpg" alt="expected" /></p>
  <p>How to solve it? Thank you very much, everybody.</p>