I am new to wordpress, I am trying to develop a theme on localhost, I am trying to load style.css using this code in functions.php

function add_theme_scripts() {
 wp_enqueue_style( 'style', get_stylesheet_uri() );
   }
 add_action( 'wp_enqueue_scripts', 'add_theme_scripts' );

And style.css is

body{background:green;}

But this code is not working

Can someone explain what i am doing wrong here ?