Why is styling not appearing?

Question

https://code.sololearn.com/WN8JU5h4zMg7/?ref=app

Answer 1

Well the syntax isn't
body {
.sky {

}
}

Answer 2

You can't nest styles in css.
Take it out the body tag in the css side and it should work just fine..
https://code.sololearn.com/WUts78T5T99B/?ref=app

Answer 3

Agghh!! thank you!