Rohit ranjan u can follow this steps
a.Enter into folder /var/www/html
b.Rename index.html to index_replica.html file
c.create new file index.html and paste below code in it
$ cd /var/www/html
$ sudo mv index.html index_replica.html
$ sudo vi index.html
(
<!DOCTYPE html>
<html>
<body style="background-color:powderblue;">
<h1>Hello its server no 1 </h1>
</body>
</html>
)