Hi @manish_ghimire and welcome to the community 
Great work on your first big exercise. 
Here are some remarks:
-
<address>is used for more than just the street and town. For example the name and contact details. You should replace<header>with<address>. The only thing that doesn’t belong to the address is<time>.<time>should get it’s own<p>with thesender-columnclass. - For the source of the quote on the last line we should use the
<cite>element instead of<em>. - Everything else is correct.
Have a nice day,
Michael
Hello @mikoMK Thank you for your review I revised the techniques and completed the letter once again from the scratch.
Here’s the final letter.
https://codepen.io/manish-ghimire-cs50/pen/gOedyBa
once again, thank you for your help…
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Great improvements, @manish_ghimire
Now everything looks fine 
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