title: Why don't PrimeNG buttons classes work even if i have primeNG installed properly?
body: <p>My problem is that I can't design buttons using default classes in primeNG..</p>
  
  <p>Steps that I took:
  I have installed it in NPM locally.
  I have added button modules into app-modules.
  I have included it in angular.json.
  - have included it in package.json.</p>
  
  <p>This is how my webpage should look like:
  <a href="https://i.stack.imgur.com/TzM6H.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TzM6H.png" alt="tutorial"></a></p>
  
  <p>But this is how it actually looks like:</p>
  
  <p><a href="https://i.stack.imgur.com/9Pa53.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9Pa53.png" alt="my image"></a></p>
  
  <p>I am not sure why.</p>