Help me in solving HTML12 problem

My issue

About Greece

<p><u>Greece</u> officially the Hellenic Republic is a country in south East Europe.</p>
<p>Greece has the longest coastline on the Mediterranean Basin, featuring thousands of islands</p>


<h2>Importance of Greece</h2>
<i>Greece is considered the cradle of Western civilization, being the birthplace of democracy, Western philosophy, Western literature, historiography, political science, major scientific and mathematical principles, theatre and the Olympic Games.</i>

About Greece
Greece officially the Hellenic Republic is a country in south East Europe.

Greece has the longest coastline on the Mediterranean Basin, featuring thousands of islands

Importance of Greece
Greece is considered the cradle of Western civilization, being the birthplace of democracy, Western philosophy, Western literature, historiography, political science, major scientific and mathematical principles, theatre and the Olympic Games.

why showing this error ?:
After the 1st line, did you use the
tag to shift ‘Greece has the longest coastline’ to a new line?

My code

// your code goes here

Learning course: Learn HTML / CSS
Problem Link: Recap in HTML / CSS