The background-size CSS property lets you resize the background image of an element, overriding the default behavior of tiling the image at its full size.
The answer is yes, you can either use a backslash (Windows) or a forward-slash (Linux) with a full path or you can use a relative path if the image is present ...
The background-image property sets one or more background images for an element. By default, a background-image is placed at the top-left corner of an element.
To add a background image on an HTML element, use the HTML style attribute and the CSS background-image property. Background Repeat · The Picture Element · Try it Yourself