How to change opacity of a background image?

Question

I have this in css

body {
background-image: url()
}
and I must change transparency of image.

Answer 1

background image:url(google.com);
opacity:1;

Answer 2

can use filters too
https://code.sololearn.com/WtmaPIKZl5RL/?ref=app

Answer 3

Thanks!