nginx is considering only .html files with the name "index"

Hi Team ,

I am configuring nginx in Windows . When i am changing the file name from index.html to sample.html or any other name it is throwing an error

403 Forbidden error

Initially i thought it is Permission error but i figured out it is the file name

How to change the default.conf to serve any files with .html extension

Thanks & Regards
Nisharunnisa