Sure you can create a file using a simple text editor for custom css and name it using this format: templatefolder-custom.css (e.g., rt_kirigami-custom.css or gantry-custom.css). For this issue add this to the custom CSS file.items-row.cols-1 {background: url([b]path-to-the-image[/b]) 0 100% no-repeat;padding-bottom: 30px;}
More Info here:
www.gantry-framework.org/documentation/j...custom_stylesheet.md