Alpus provides many prebuilt demos and various elements for build site. Anyway, we can’t gratify all user’s desire because of person’s infinite creative imagination.
So Alpus offers the option for add custom style and custom js and by using this you can build your site as you want.
As you know, there are custom css and js in theme options but that values give effect to all pages.
If you want to add custom style and script in own page, there are 2 ways.
You can find Custom Page CSS and Custom Page JS in elements addon section and page settings section.