set background image css from folder code example
Example 1: background image syntax in css if it is in folder
/* The first method using an image on your server */
background: url('img/someimage.jpg');
/* The second method using an image hosted on another server */
background: url('http://www.someimage.com/someimage.jpg');
/* A third method that allows the site to determine protocol instead of explicitly defining it */
background: url('//www.someimage.com/someimage.jpg');
Example 2: background image syntax in css if it in folder
body {
background: radial-gradient(circle, black, white);
}