You use custom css in the examples, I was trying to find what the jumbotron-heading class is, I did not find it, after losing 20 minutes I discovered it's a custom css ... I think the examples should not use custom css.
I didn't find what you say in example jumbotron page. What do you mean? Which class?
@leodluz are u refering to class display-4 . This class is not a custom class
I guess they mean jumbotron-heading…?
I looked at the documentation page, not examples pages. You're right.
I guess the examples could be split into two folders, maybe: one using only “vanilla” Bootstrap and another one with possible customisations you can make. 🤔

Of course it's my ignorance, but I'm giving beginner feedback, maybe it's useful.
I took the week to study bootstrap heavily. I had a lot of confusion, but with effort I think I was able to clarify everything. Thanks, this tool is awesome.
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Of course it's my ignorance, but I'm giving beginner feedback, maybe it's useful.
I took the week to study bootstrap heavily. I had a lot of confusion, but with effort I think I was able to clarify everything. Thanks, this tool is awesome.