How to remove header and footer in Google docs

This video shows how to get rid of (remove/delete) header and footer from the document in Google docs.
Please follow below steps -
1 - Copy the content from the document from which you want to remove header by pressing ctrl+A and ctrl + c
2 - Create new Google document and set top and bottom margin as 0
3 - Then paste the contents from original document to new document by pressing ctrl +v.
4. In new document, you will see that the header and footer is removed