This members-only tutorial provides the steps to apply CSS counter for Repeater in Oxygen so that the Repeater Divs automatically get numbered that increment from 1.
Step 1
In the Oxygen editor add your Repeater. In this example, we shall add one on a static Page that pulls the latest 3 blog posts showing their featured image and title.
Grid Layout > Enable Grid. Set Column Count to 3 and (column) Gap to say, 40px.