Background image not showing in html

- Background image not showing in email html
- Background image not showing html css
- Why is my background image not showing in html
- Background image not displaying in html
- Background image not repeat in html
- Background image not working in html
- Background image not showing properly in html
- Background image not showing in print preview html
- Html email background image not showing in outlook
- Html email background image not showing in outlook 2016
- Background image not printing in html
- Background image not loading in html
- Background image not coming in html
- Background image not displaying in html css