How could I set a picture in the background of the page.

Question

I want to set the picture in this code on the whole page. How could I do so?
https://code.sololearn.com/WH7yyc0ATB6J/?ref=app

Answer 1

Insert this in the css body-tag

background-repeat: no-repeat;
    background-position: right top;
    background-attachment: fixed;

Answer 2

Try div class
https://code.sololearn.com/Wk23wkzu6TUo/?ref=app