Answer 1

Hey Chota Pathak
There is a simple way to modify you web page.
Note : if it is yours.

Just open source code, edit stuff you want to edit and make it live server again.
And by word customize you mean about styling and stuff, you need CSS and it's frameworks like bootstrap.
You can not use python for these things.

P.S. you can edit it only if it is yours.

Answer 2

What do you mean by something new here? Please be specific while asking a question to get better help.