Bhagavad Gita Quotes

Hello sir, I want your help in learning the code and method used by you to make this such beautiful extension.

I want to make a kind of same in type like yours extension, i want your help in understanding the way of building this extension, I am second year new in this tech field but every much interested can you help me out. If yes it would very kindof you
Dhanyavad ,
Radhekrishna
contact- rajmishra52002@gmail.com