Help me in solving HTML12 problem

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My issue

what is error

My code

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.

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Learning course: [Learn HTML / CSS](https://www.codechef.com/learn/course/html)
Problem Link: https://www.codechef.com/learn/course/html/HTMLC01/problems/HTML12