Why are Bootstrap 4 components not displaying correctly?

Question

css

I took a ready-made section from the site bootstrap 4 material design (mdbootstrap.com), and it is displayed as if some styles are not connected. At the same time, all other elements and ready-made sections are displayed as they should. What could be the problem?
Everything is connected via cdn, including all js files. I also tried to download bootstrap for another site - the same result. There are no errors in the console.

Answer 1

I assume that you do not have a Pro version, but this is a Pro component