How can I place a green screen like image at the background?

Question

Is it green screen?

Answer 1

CLEO ANGELO DIMAILIG please make your question more clear and add relevant language tag.

Answer 2

Do you want to keep green color as an background then :-
In css

body {
background-color:green;
}

If image then :-

In css

body {
background:url("You image link");
}