Help with

Hello, first, sorry for my problems with the language.

I tried to start projects with codepen but I can’t center the elements.
I’ve done 3 times but not successful. I’ve tried everything but I do not understand the fault I have with the page.

I have tried to copy other projects to test right but when hit lose all design . It is a configuration problem or what?

You need to include jQuery and Bootstrap. Here’s how.