How can i import image as background on my html page

Question

I tried it in my module calculator though and no result
https://code.sololearn.com/WAgY0O35aOxa/?ref=app

Answer 1

https://www.sololearn.com/discuss/1689176/?ref=app
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https://www.sololearn.com/discuss/1091348/?ref=app
https://www.sololearn.com/discuss/2924263/?ref=app
https://www.sololearn.com/discuss/949978/?ref=app
https://www.sololearn.com/discuss/2279350/?ref=app
https://www.sololearn.com/discuss/1661260/?ref=app
https://www.sololearn.com/discuss/2366706/?ref=app
https://www.sololearn.com/discuss/1520321/?ref=app
https://www.sololearn.com/discuss/976441/?ref=app
https://www.sololearn.com/discuss/2935291/?ref=app
https://www.sololearn.com/discuss/1538186/?ref=app
https://www.sololearn.com/discuss/2584984/?ref=app