How do you put a full background image on HTML?

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Tags

1. #class
2. #pixels
3. #assigning
4. #responsive
5. #opening
6. #image
7. #after
8. #break
9. #screen
10. #background
11. #document
12. #below
13. #content
14. #complete
15. #pushing
16. #whole
17. #point