Duplicate Template to a new page

I need some help with my website, how can I duplicate the template from my website?

I tried duplicating the page, but that doesn’t work because all the CSS disappears.

So, here’s a brief example. I want to copy the same content (all the content, from the top bar and foot bar) from my front page to a new page, because I want exactly the same content, but obviously after doing this I will change the text and so on. I’m using an Astra Theme with Agency theme.

Thanks in advance.

The page I need help with: [log in to see the link]