Help me in solving HTML12 problem

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My issue

next button is not click

My code

    <!-- Type your code below this line -->
    <h2>About Greece</h2>
    <P><u>Greece</u> offically the Hellenic Republic is a country in south East Europe.
    <br>Greece has the longest coastline on the Mediterranean Basin,featuring thousands of islands.</P>
    <h2>Importance of Greece</h2>
   <P> <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></p>
</body>
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Learning course: Learn HTML / CSS
Problem Link: Recap Practice Problem in HTML / CSS - CodeChef