The first cell contains:
%auto html(""" <style> .bigpink { color: pink; font-size: 50px; font-weight: bold; background: green; padding: 30px; text-align: center; } </style> """)
and get rid of the hide=False in the second cell.
hide=False
html("<div class='bigpink'>I am Big and Pink</div>", hide=False)