How can I add more colors in Ionic 4 and use them as color in different components like the Button, Item and so on?

Many of us often need a way to prevent users from accessing certain pages in our app. This might not be super obvious when only focused on mobile apps, but think about a URL to a website. Your path is exactly this, and some users should simply not be allowed to visit that page if they are not authenticated.

The new navigation system inside Ionic Framework 4.0,  how to use the powerful CLI, to understand how your Ionic 3 logic can be converted to v4.