Codepen project problem

I am learning to code with camp. I am now on a stage to build front end projects.
Freecode camp suggest Codepen and the first project is tribute page.

My learning style is copying and editing existing templates. I have copied the code of Norman Borlaug tribute page and pasted to new Codepen project. However, although I have used the same codes, new project doesnt look exactly similar to the ones I have copied from.

Do you know why this happens?

Thank you for your responses.

That’s a shortcut, not a learning style. You should be writing your own code.

You probably haven’t added Bootstrap to your project sources.