Updating Hilda docs

Author: webmandesign

hilda/assets/images/boxed.jpg

@@ -5,3 +5,5 @@
 	p The theme can be set to "boxed" layout, meaning it will create a margin around site container on large screens (wider than 1600px). This can be done by setting up the "<strong>Site container</strong>" color in theme options.
 
 	p If you leave (set) the color value empty, site container will stretch the full width of the browser window, removing the boxed margin.
+
+	+image( 'boxed.jpg', 'Setting empty value for site container background color' )